1
21521014fa
LTC2152-14/
LTC2151-14/LTC2150-14
For more information www.linear.com/LTC2152-14
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
14-Bit 250Msps/
210Msps/170Msps ADCs
n Communications
n Cellular Basestations
n Software Defined Radios
n Medical Imaging
n High Definition Video
n Testing and Measurement Instruments
n 70dB SNR
n 90dB SFDR
n Low Power: 356mW/338mW/313mW Total
n Single 1.8V Supply
n DDR LVDS Outputs
n Easy-to-Drive 1.5VP-P Input Range
n 1.25GHz Full Power Bandwidth S/H
n Optional Clock Duty Cycle Stabilizer
n Low Power Sleep and Nap Modes
n Serial SPI Port for Configuration
n Pin Compatible 12-Bit Versions
n 40-Pin (6mm × 6mm) QFN Package
The LTC
®
2152-14/LTC2151-14/LTC2150-14 are 250Msps/
210Msps/170Msps 14-bit A/D converters designed for
digitizing high frequency, wide dynamic range signals.
They are perfect for demanding communications applica-
tions with AC performance that includes 70dB SNR and
90dB spurious free dynamic range (SFDR). The 1.25GHz
input bandwidth allows the ADC to undersample high
frequencies with good performance. The latency is only
six clock cycles.
DC specs include ±0.85LSB INL (typ), ±0.25LSB DNL (typ)
and no missing codes over temperature. The transition
noise is 1.82LSBRMS.
The digital outputs are double-data rate (DDR) LVDS.
The ENC+ and ENC– inputs can be driven differentially with
a sine wave, PECL, LVDS, TTL, or CMOS inputs. An optional
clock duty cycle stabilizer allows high performance at full
speed for a wide range of clock duty cycles.
L, LT, LT C , LT M , Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
LTC2152-14: 32K Point FFT,
fIN = 15MHz, –1dBFS, 250Msps
S/H CORRECTION
LOGIC OUTPUT
DRIVERS
14-BIT
PIPELINED
ADC
CLOCK/DUTY
CYCLE
CONTROL
D12_13
•
•
•
D0_1
CLOCK
ANALOG
INPUT
21521014 TA01a
DDR
LVDS
VDD
OVDD
OGND
FREQUENCY (MHz)
0
–120
AMPLITUDE (dBFS)
–100
–80
–60
–40
0
20 40 60 80
21521014 TA01b
100 120
–20
LTC2152-14/
LTC2151-14/LTC2150-14
2
21521014fa
For more information www.linear.com/LTC2152-14
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
VDD, OVDD ................................................ –0.3V to 2V
Analog Input Voltage
AIN+, AIN–, PAR/SER,
SENSE (Note 3) ........................ –0.3V to (VDD + 0.2V)
Digital Input Voltage
ENC+, ENC– (Note 3) ................ –0.3V to (VDD + 0.3V)
CS, SDI, SCK (Note 4) ........................... –0.3V to 3.9V
SDO (Note 4) ............................................. –0.3V to 3.9V
Digital Output Voltage ................ –0.3V to (OVDD + 0.3V)
Operating Temperature Range
LTC2152C, LTC2151C, LTC2150C ............. 0°C to 70°C
LTC2152I, LTC2151I, LTC2150I ............–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
(Notes 1, 2)
PIN CONFIGURATION
3940 38 37 36 35 34 33 32 31
11 20
12 13 14 15
TOP VIEW
GND
41
UJ PACKAGE
40-LEAD (6mm × 6mm) PLASTIC QFN
16 17 18 19
22
23
24
25
26
27
28
29
9
8
7
6
5
4
3
2
VDD
VDD
GND
AIN+
AIN–
GND
SENSE
VREF
VCM
GND
OVDD
D8_9+
D8_9–
CLKOUT+
CLKOUT–
D6_7+
D6_7–
D4_5+
D4_5–
OGND
PAR/SER
CS
SCK
SDI
SDO
GND
D12_13+
D12_13–
D10_11+
D10_11–
ENC+
ENC–
GND
OF–
OF+
D0_1–
D0_1+
D2_3–
D2_3+
OVDD
21
30
10
1
TJMAX = 150°C, θJA = 34.1°C/W
EXPOSED PAD (PIN 41) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2152CUJ-14#PBF LTC2152CUJ-14#TRPBF LTC2152UJ-14 40-Lead (6mm × 6mm) Plastic QFN 0°C to 70°C
LTC2152IUJ-14#PBF LTC2152IUJ-14#TRPBF LTC2152UJ-14 40-Lead (6mm × 6mm) Plastic QFN –40°C to 85°C
LTC2151CUJ-14#PBF LTC2151CUJ-14#TRPBF LTC2151UJ-14 40-Lead (6mm × 6mm) Plastic QFN 0°C to 70°C
LTC2151IUJ-14#PBF LTC2151IUJ-14#TRPBF LTC2151UJ-14 40-Lead (6mm × 6mm) Plastic QFN –40°C to 85°C
LTC2150CUJ-14#PBF LTC2150CUJ-14#TRPBF LTC2150UJ-14 40-Lead (6mm × 6mm) Plastic QFN 0°C to 70°C
LTC2150IUJ-14#PBF LTC2150IUJ-14#TRPBF LTC2150UJ-14 40-Lead (6mm × 6mm) Plastic QFN –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping
container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
3
21521014fa
LTC2152-14/
LTC2151-14/LTC2150-14
For more information www.linear.com/LTC2152-14
CONVERTER CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 5)
PARAMETER CONDITIONS
LTC2152-14 LTC2151-14 LTC2150-14
UNITSMIN TYP MAX MIN TYP MAX MIN TYP MAX
Resolution (No Missing Codes) l14 14 14 Bits
Integral Linearity Error Differential Analog Input (Note 6) l–5.5 ±0.85 5.5 –5.1 ±1 5.1 –5.1 ±1 5.1 LSB
Differential Linearity Error Differential Analog Input l–0.9 ±0.25 0.9 –0.9 ±0.25 0.9 –0.9 ±0.25 0.9 LSB
Offset Error (Note 7) l–13 ±5 13 –13 ±5 13 –13 ±3 13 mV
Gain Error External Reference l–4 ±1 3 –4 ±1 3 –4 ±1 3 %FS
Offset Drift ±20 ±20 ±20 µV/°C
Full-Scale Drift Internal Reference
External Reference
±30
±10
±30
±10
±30
±10
ppm/°C
ppm/°C
Transition Noise External Reference 1.82 1.82 1.82 LSBRMS
ANALOG INPUT
The l denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at TA = 25°C. (Note 5)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Analog Input Range (AIN+ – AIN–) 1.7V < VDD < 1.9V l1.5 VP-P
VIN(CM) Analog Input Common Mode (AIN+ + AIN–)/2 Differential Analog Input (Note 8) lVCM – 20mV VCM VCM + 20mV V
VSENSE External Reference Mode External Reference Mode l1.200 1.250 1.300 V
IIN1 Analog Input Leakage Current 0 < AIN+, AIN– < VDD No Encode l–1 1 µA
IIN2 SENSE Input Leakage Current 1.2V < SENSE < 1.3V l–1 1 µA
IIN3 PAR/SER Input Leakage Current 0 < PAR/SER < VDD l–1 1 µA
tAP Sample-and-Hold Acquisition Delay Time 1 ns
tJITTER Sample-and-Hold Acquisition Delay Jitter 0.15 psRMS
CMRR Analog Input Common Mode Rejection Ratio 75 dB
BW-3B Full-Power Bandwidth 1250 MHz
DYNAMIC ACCURACY
The l denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at TA = 25°C. AIN = –1dBFS. (Note 5)
SYMBOL PARAMETER CONDITIONS
LTC2152-14 LTC2151-14 LTC2150-14
UNITSMIN TYP MAX MIN TYP MAX MIN TYP MAX
SNR Signal-to-Noise Ratio 15MHz Input
70MHz Input
140MHz Input
l
67.3
70
69.7
69.3
67.4
70
69.8
69.4
67.5
70
69.8
69.5
dBFS
dBFS
dBFS
SFDR Spurious Free Dynamic Range
2nd or 3rd Harmonic
15MHz Input
70MHz Input
140MHz Input
l
72
90
85
82
75
90
85
82
76
90
85
83
dBFS
dBFS
dBFS
Spurious Free Dynamic Range
4th Harmonic or Higher
15MHz Input
70MHz Input
140MHz Input
l
81
95
95
85
82
95
95
88
83
98
95
88
dBFS
dBFS
dBFS
S/(N+D) Signal-to-Noise Plus
Distortion Ratio
15MHz Input
70MHz Input
140MHz Input
l
66.7
69.9
69.4
68.8
66.8
69.9
69.4
68.8
66.9
69.9
69.4
68.8
dBFS
dBFS
dBFS
Cross Talk Cross-Talk Between Channels Up to 315MHz Input –95 –95 –95 dB
LTC2152-14/
LTC2151-14/LTC2150-14
4
21521014fa
For more information www.linear.com/LTC2152-14
INTERNAL REFERENCE CHARACTERISTICS
The l denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at TA = 25°C. (Note 5)
PARAMETER CONDITIONS MIN TYP MAX UNITS
VCM Output Voltage IOUT = 0 0.439 •
VDD – 18mV
0.439 •
VDD
0.439 •
VDD + 18mV
V
VCM Output Temperature Drift ±37 ppm/°C
VCM Output Resistance –1mA < IOUT < 1mA 4 Ω
VREF Output Voltage IOUT = 0 1.225 1.250 1.275 V
VREF Output Temperature Drift ±30 ppm/°C
VREF Output Resistance –400µA < IOUT < 1mA 7 Ω
VREF Line Regulation 1.7V < VDD < 1.9V 0.6 mV/V
DIGITAL INPUTS AND OUTPUTS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 5)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
ENCODE INPUTS (ENC+, ENC– )
VID Differential Input Voltage (Note 8) l0.2 1 1.9 V
VICM Common Mode Input Voltage Internally Set
Externally Set (Note 8)
l
1.1
1.2
1.5
V
V
VIN Input Voltage Range ENC+, ENC– to GND l0.2 1.9 V
RIN Input Resistance (See Figure 2) 10 kΩ
CIN Input Capacitance (Note 8) 2 pF
DIGITAL INPUTS (CS, SDI, SCK)
VIH High Level Input Voltage VDD = 1.8V l1.3 V
VIL Low Level Input Voltage VDD = 1.8V l0.6 V
IIN Input Current VIN = 0V to 1.8V l–10 10 µA
CIN Input Capacitance (Note 8) 3 pF
SDO OUTPUT (Open-Drain Output. Requires 2k Pull-Up Resistor if SDO Is Used)
ROL Logic Low Output Resistance to GND VDD = 1.8V, SDO = 0V 200 Ω
IOH Logic High Output Leakage Current SDO = 0V to 3.6V l–10 10 µA
COUT Output Capacitance (Note 8) 4 pF
POWER REQUIREMENTS
The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. (Note 5)
SYMBOL PARAMETER CONDITIONS
LTC2152-14 LTC2151-14 LTC2150-14
UNITSMIN TYP MAX MIN TYP MAX MIN TYP MAX
VDD Analog Supply Voltage (Note 9) l1.7 1.8 1.9 1.7 1.8 1.9 1.7 1.8 1.9 V
OVDD Output Supply Voltage LVDS Mode (Note 9) l1.7 1.8 1.9 1.7 1.8 1.9 1.7 1.8 1.9 V
IVDD Analog Supply Current l169 186 160 176 147 162 mA
IOVDD Digital Supply Current 1.75mA LVDS Mode
3.5mA LVDS Mode
l
29
49
34.5
54.5
28
48
33.5
54
27
47
32.5
52
mA
mA
PDISS Power Dissipation 1.75mA LVDS Mode
3.5mA LVDS Mode
l
356
392
397
433
338
374
377
414
313
349
350
385
mW
mW
PSLEEP Nap Mode Power Clocked at fS(MAX) 105 98 93 mW
PNAP Sleep Mode Power Clocked at fS(MAX) <2 <2 <2 mW
5
21521014fa
LTC2152-14/
LTC2151-14/LTC2150-14
For more information www.linear.com/LTC2152-14
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DIGITAL DATA OUTPUTS
VOD Differential Output Voltage 100Ω Differential Load, 3.5mA Mode
100Ω Differential Load, 1.75mA Mode
l
l
247
125
350
175
454
250
mV
mV
VOS Common Mode Output Voltage 100Ω Differential Load, 3.5mA Mode
100Ω Differential Load, 1.75mA Mode
l
l
1.125
1.125
1.250
1.250
1.375
1.375
V
V
RTERM On-Chip Termination Resistance Termination Enabled, OVDD = 1.8V 100 Ω
DIGITAL INPUTS AND OUTPUTS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 5)
TIMING CHARACTERISTICS
The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. (Note 5)
SYMBOL PARAMETER CONDITIONS
LTC2152-14 LTC2151-14 LTC2150-14
UNITSMIN TYP MAX MIN TYP MAX MIN TYP MAX
fSSampling Frequency (Note 9) l10 250 10 210 10 170 MHz
tLENC Low Time (Note 8) Duty Cycle Stabilizer Off
Duty Cycle Stabilizer On
l
l
1.9
1.5
2
2
50
50
2.26
1.5
2.38
2.38
50
50
2.79
1.5
2.94
2.94
50
50
ns
ns
tHENC High Time (Note 8) Duty Cycle Stabilizer Off
Duty Cycle Stabilizer On
l
l
1.9
1.5
2
2
50
50
2.26
1.5
2.38
2.38
50
50
2.79
1.5
2.94
2.94
50
50
ns
ns
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DIGITAL DATA OUTPUTS
tDENC to Data Delay CL = 5pF (Note 8) l1.7 2 2.3 ns
tCENC to CLKOUT Delay CL = 5pF (Note 8) l1.3 1.6 2 ns
tSKEW DATA to CLKOUT Skew tD – tC (Note 8) l0.3 0.4 0.55 ns
Pipeline Latency 6 6 Cycles
SPI Port Timing (Note 8)
tSCK SCK Period Write Mode, CSDO = 20pF
Readback Mode RPULLUP = 2k, CSDO = 20pF
40
250
ns
ns
tSCS to SCK Set-Up Time l5 ns
tHSCK to CS Hold Time l5 ns
tDS SDI Set-Up Time l5 ns
tDH SDI Hold Time l5 ns
tDO SCK Falling to SDO Valid Readback Mode RPULLUP = 2k, CSDO = 20pF l125 ns
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All voltage values are with respect to GND with GND and OGND
shorted (unless otherwise noted).
Note 3: When these pin voltages are taken below GND or above VDD, they
will be clamped by internal diodes. This product can handle input currents
of greater than 100mA below GND or above VDD without latchup.
Note 4: When these pin voltages are taken below GND they will be
clamped by internal diodes. When these pin voltages are taken above VDD
they will not be clamped by internal diodes. This product can handle input
currents of greater than 100mA below GND without latchup.
Note 5: V
DD
= OV
DD
= 1.8V, f
SAMPLE
= 250MHz (LTC2152),
210MHz (LTC2151), or 170MHz (LTC2150), LVDS outputs, differential
ENC+/ENC– = 2V
P-P
sine wave, input range = 1.5V
P-P
with differential
drive, unless otherwise noted.
Note 6: Integral nonlinearity is defined as the deviation of a code from a
best fit straight line to the transfer curve. The deviation is measured from
the center of the quantization band.
Note 7: Offset error is the offset voltage measured from –0.5LSB when the
output code flickers between 00 0000 0000 0000 and 11 1111 1111 1111
in 2’s complement output mode.
Note 8: Guaranteed by design, not subject to test.
Note 9: Recommended operating conditions.
LTC2152-14/
LTC2151-14/LTC2150-14
6
21521014fa
For more information www.linear.com/LTC2152-14
TYPICAL PERFORMANCE CHARACTERISTICS
LTC2152-14: Integral Nonlinearity
(INL)
LTC2152-14: Differential
Nonlinearity (DNL)
LTC2152-14: 32K Point FFT,
fIN = 15MHz, –1dBFS, 250Msps
LTC2152-14: 32K Point FFT,
fIN = 70MHz, –1dBFS, 250Msps
LTC2152-14: 32K Point FFT,
fIN = 122MHz, –1dBFS, 250Msps
LTC2152-14: 32K Point FFT,
fIN = 381MHz, –1dBFS, 250Msps
LTC2152-14: 32K Point FFT,
fIN = 229MHz, –1dBFS, 250Msps
LTC2152-14: 32K Point FFT,
fIN = 171MHz, –1dBFS, 250Msps
FREQUENCY (MHz)
0
–120
AMPLITUDE (dBFS)
–100
–80
–60
–40
0
20 40 60 80
21521014 G03
100 120
–20
FREQUENCY (MHz)
0
–120
AMPLITUDE (dBFS)
–100
–80
–60
–40
0
20 40 60 80
21521014 G04
100 120
–20
FREQUENCY (MHz)
0
–120
AMPLITUDE (dBFS)
–100
–80
–60
–40
0
20 40 60 80
21521014 G05
100 120
–20
FREQUENCY (MHz)
0
–120
AMPLITUDE (dBFS)
–100
–80
–60
–40
0
20 40 60 80
21521014 G06
100 120
–20
FREQUENCY (MHz)
0
–120
AMPLITUDE (dBFS)
–100
–80
–60
–40
0
20 40 60 80
21521014 G07
100 120
–20
FREQUENCY (MHz)
0
–120
AMPLITUDE (dBFS)
–100
–80
–60
–40
0
20 40 60 80
21521014 G08
100 120
–20
OUTPUT CODE
0
–2.0
–1.5
–1.0
–0.5
INL ERROR (LSB)
0
0.5
2.0
1.5
1.0
4096 8192 12288 16383
21521014 G01
OUTPUT CODE
0
–0.4
–0.2
DNL ERROR (LSB)
0
0.2
0.4
4096 8192 12288 16383
21521014 G02
7
21521014fa
LTC2152-14/
LTC2151-14/LTC2150-14
For more information www.linear.com/LTC2152-14
LTC2152-14: 32K Point FFT, fIN =
907MHz, –1dBFS, 250Msps
LTC2152-14: 32K Point 2-Tone
FFT, fIN = 70.5MHz and 69.5MHz,
250Msps
LTC2152-14: Shorted Input
Histogram
LTC2152-14: IOVDD vs Sample
Rate, 15MHz Sine Wave Input,
–1dBFS
LTC2152-14: IVDD vs Sample
Rate, 15MHz Sine Wave Input,
–1dBFS
LTC2152-14: 32K Point FFT, fIN =
421MHz, –1dBFS, 250MHz
LTC2152-14: 32K Point FFT, fIN =
571MHz, –1dBFS, 250MHz
TYPICAL PERFORMANCE CHARACTERISTICS
LTC2152-14: SFDR vs Input
Level, fIN = 70MHz, 1.5V Range,
250Msps
0
–120
AMPLITUDE (dBFS)
–100
–80
–60
–40
0
20 40 60 80
21521014 G10
100 120
–20
INPUT FREQUENCY (MHz)
0
–120
AMPLITUDE (dBFS)
–100
–80
–60
–40
0
20 40 60 80
21521014 G11
100 120
–20
INPUT FREQUENCY (MHz)
0
–120
AMPLITUDE (dBFS)
–100
–80
–60
–40
0
20 40 60 80
21521014 G12
100 120
–20
INPUT FREQUENCY (MHz) SAMPLE RATE (Msps)
0
15
IOVDD (mA)
20
25
30
35
40
45
50
50 100 150 200 250
21521014 G14
LVDS CURRENT
3.5mA
LVDS CURRENT
1.75mA
SAMPLE RATE (Msps)
0
110
IVDD (mA)
120
130
140
150
160
170
50 100 150 200
250
21521014 G15 AMPLITUDE (dBFS)
–80
20
0
SFDR (dBc AND dBFS)
40
60
80
100
120
–60 –40 –20
–70 –50 –30 –10 0
21521014 G16
dBFS
dBc
0
–120
AMPLITUDE (dBFS)
–100
–80
–60
–40
0
20 40 60 80
21521014 G09
100 120
–20
INPUT FREQUENCY (MHz)
OUTPUT CODE
8196
0
COUNT
1000
2000
3000
8200 8204 8208 8212
4000
500
1500
2500
3500
8216
215210 G13
LTC2152-14/
LTC2151-14/LTC2150-14
8
21521014fa
For more information www.linear.com/LTC2152-14
TYPICAL PERFORMANCE CHARACTERISTICS
LTC2152-14: Frequency Response
1000
100
INPUT FREQUENCY (MHz)
INPUT AMPLITUDE (dBFS)
–4.0
–1.5
–1.0
–0.5
–5.0
–2.5
–4.5
–2.0
–5.5
–6.0
–3.0
–3.5
21521014 G20
LTC2152-14: SNR vs Input
Frequency, –1dBFS, 1.5V Range,
250Msps
INPUT FREQUENCY (MHz)
0
SNR (dBFS)
65
75
700
55
50
200 400
100 900
300 500 800
600 1000
45
40
60
70
LTC2152-14: SFDR vs Input
Frequency, –1dBFS, 1.5V Range,
250Msps
INPUT FREQUENCY (MHz)
0
SFDR (dBFS)
50
70
90
700
30
20
200 400
100 900
300 500 800
600 1000
10
0
40
60
80
21521014 G18
LTC2152-14: SNR vs Input Level,
fIN = 70MHz, 1.5V Range, 250Msps
INPUT LEVEL (dBFS)
10
0
SNR (dBc AND dBFS)
20
30
40
50
80
70
60
–70 –50 –30–60 –40 –20 –10 0
21521014 G17
dBFS
dBc