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PDF LTC2156-14 Data sheet ( Hoja de datos )
| Número de pieza | LTC2156-14 | |
| Descripción | Dual 14-Bit 250Msps/210Msps/170Msps ADCs | |
| Fabricantes | Linear | |
| Logotipo |  |
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FEATURES
n 70dB SNR
n 90dB SFDR
n Low Power: 650mW/616mW/567mW 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 64-Pin (9mm × 9mm) QFN Package
APPLICATIONS
n Communications
n Cellular Basestations
n Software Defined Radios
n Medical Imaging
n High Definition Video
n Testing and Measurement Instruments
LTC2157-14/
LTC2156-14/LTC2155-14
Dual 14-Bit 250Msps/
210Msps/170Msps ADCs
DESCRIPTION
The LTC®2157-14/LTC2156-14/LTC2155-14 are 2-channel
simultaneous sampling 250Msps/210Msps/170Msps
14-bit A/D converters designed for digitizing high fre-
quency, wide dynamic range signals. They are perfect
for demanding communications applications 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, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
ANALOG
INPUT
S/H
VDD
CHANNEL A
14-BIT
PIPELINED
ADC CORE
CORRECTION
LOGIC
CLOCK
CLOCK/DUTY
CYCLE
CONTROL
ANALOG
INPUT
S/H
CHANNEL B
14-BIT
PIPELINED
ADC CORE
CORRECTION
LOGIC
GND
OUTPUT
DRIVERS
OVDD
DA12_13
•
•
•
DA0_1
DDR
LVDS
OGND
OVDD
OUTPUT
DRIVERS
DB12_13
•
•
•
DB0_1
DDR
LVDS
21576514 TA01
OGND
LTC2157-14 32K Point FFT,
fIN = 15MHz, –1dBFS, 250Msps
0
–20
–40
–60
–80
–100
–120
0
20 40 60 80 100 120
FREQUENCY (MHz)
21576514 TA01b
For more information www.linear.com/LTC2157-14
21576514fb
1
1 page  
LTC2157-14/
LTC2156-14/LTC2155-14
D IGITAL 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
DIGITAL DATA OUTPUTS
VOD
VOS
RTERM
Differential Output Voltage
Common Mode Output Voltage
On-Chip Termination Resistance
100Ω Differential Load, 3.5mA Mode
100Ω Differential Load, 1.75mA Mode
100Ω Differential Load, 3.5mA Mode
100Ω Differential Load, 1.75mA Mode
Termination Enabled, OVDD = 1.8V
l 247
l 125
l 1.125
l 1.125
350
175
1.250
1.250
100
454
250
1.375
1.375
mV
mV
V
V
Ω
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
LTC2157-14
LTC2156-14
LTC2155-14
MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS
fS Sampling Frequency (Note 9)
l 10
250 10
210 10
170 MHz
tL
ENC Low Time (Note 8) Duty Cycle Stabilizer Off l 1.9 2 50 2.26 2.38 50 2.79 2.94 50
ns
Duty Cycle Stabilizer On l 1.5 2 50 1.5 2.38 50 1.5 2.94 50
ns
tH
ENC High Time (Note 8) Duty Cycle Stabilizer Off l 1.9 2 50 2.26 2.38 50 2.79 2.94 50
Duty Cycle Stabilizer On l 1.5 2 50 1.5 2.38 50 1.5 2.94 50
ns
ns
DIGITAL DATA OUTPUTS
SYMBOL PARAMETER
tD
tC
tSKEW
ENC to Data Delay
ENC to CLKOUT Delay
DATA to CLKOUT Skew
Pipeline Latency
SPI Port Timing (Note 8)
tSCK SCK Period
tS CS to SCK Set-Up Time
tH SCK to CS Hold Time
tDS SDI Set-Up Time
tDH SDI Hold Time
tDO SCK Falling to SDO Valid
CONDITIONS
CL = 5pF (Note 8)
CL = 5pF (Note 8)
tD – tC (Note 8)
LTC215X-14
MIN TYP MAX
l 1.7 2 2.3
l 1.3
1.6
2
l 0.3
0.4 0.55
66
Write Mode
Readback Mode CSDO= 20pF, RPULLUP = 2k
Readback Mode, CSDO = 20pF, RPULLUP = 2k
l
l
l
l
l
l
l
40
250
5
5
5
5
125
UNITS
ns
ns
ns
Cycles
ns
ns
ns
ns
ns
ns
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: VDD = OVDD
210MHz (LTC2156),
o=r11.780V,MfSHAzM(PLLTEC2=125550)M, dHifzfe(rLeTnCt2ia1l5E7N)C, +/ENC–
=
2VP-P
sine wave, input range = 1.5VP-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.
For more information www.linear.com/LTC2157-14
21576514fb
5
5 Page 
LTC2157-14/
LTC2156-14/LTC2155-14
TYPICAL PERFORMANCE CHARACTERISTICS
LTC2155-14: 32K Point FFT,
fIN = 225MHz, –1dBFS, 170Msps
0
–20
–40
–60
–80
–100
–120
0
10 20 30 40 50 60 70 80
FREQUENCY (MHz)
21576514 G41
LTC2155-14: 32K Point FFT,
fIN = 380MHz, –1dBFS, 170Msps
0
–20
–40
–60
–80
–100
–120
0
10 20 30 40 50 60 70 80
FREQUENCY (MHz)
21576514 G42
LTC2155-14: 32K Point FFT,
fIN = 571MHz, –1dBFS, 170Msps
0
–20
–40
–60
–80
–100
–120
0
10 20 30 40 50 60 70 80
FREQUENCY (MHz)
21576514 G43
LTC2155-14: 32K Point FFT,
fIN = 907MHz, –1dBFS, 170Msps
0
–20
–40
–60
–80
–100
–120
0
10 20 30 40 50 60 70 80
FREQUENCY (MHz)
21576514 G44
LTC2155-14: 32K Point 2-Tone FFT,
fIN = 70.5MHz and 69.5MHz, 170Msps
0
–20
–40
–60
–80
–100
–120
0
10 20 30 40 50 60 70 80
INPUT FREQUENCY (MHz)
21576514 G44a
LTC2155-14: Shorted
Input Histogram
4000
3500
3000
2500
2000
1500
1000
500
0
8198 8200 8202 8204 8206 8208 8210 8212 8214
OUTPUT CODE
21576514 G45
LTC2155-14: SNR vs Input Frequency,
–1dBFS, 170Msps
75
70
65
60
55
50
45
40
0 100 200 300 400 500 600 700 800 900 1000
INPUT FREQUENCY (MHz)
21576514 G46
LTC2155-14: SFDR vs Input
Frequency, –1dBFS, 170Msps
90
80
70
60
50
40
30
20
10
0
0 100 200 300 400 500 600 700 800 900 1000
INPUT FREQUENCY (MHz)
21576514 G47
For more information www.linear.com/LTC2157-14
21576514fb
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC2156-14.PDF ] | |
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