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PDF LTC2251 Data sheet ( Hoja de datos )
| Número de pieza | LTC2251 | |
| Descripción | (LTC2250 / LTC2251) 125/105Msps Low Noise 3V ADCs | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
www.datasheet4u.com
■ Sample Rate: 125Msps/105Msps
■ Single 3V Supply (2.85V to 3.4V)
■ Low Power: 395mW/320mW
■ 61.6dB SNR
■ 85dB SFDR
■ No Missing Codes
■ Flexible Input: 1VP-P to 2VP-P Range
■ 640MHz Full Power Bandwidth S/H
■ Clock Duty Cycle Stabilizer
■ Shutdown and Nap Modes
■ Pin Compatible Family:
125Msps: LTC2251 (10-Bit), LTC2253 (12-Bit)
105Msps: LTC2250 (10-Bit), LTC2252 (12-Bit)
80Msps: LTC2239 (10-Bit), LTC2229 (12-Bit)
65Msps: LTC2238 (10-Bit), LTC2228 (12-Bit)
40Msps: LTC2237 (10-Bit), LTC2227 (12-Bit)
25Msps: LTC2236 (10-Bit), LTC2226 (12-Bit)
■ 32-Pin (5mm × 5mm) QFN Package
U
APPLICATIO S
■ Wireless and Wired Broadband Communication
■ Imaging Systems
■ Ultrasound
■ Spectral Analysis
■ Portable Instrumentation
LTC2251/LTC2250
10-Bit, 125/105Msps
Low Noise 3V ADCs
DESCRIPTIO
The LTC®2251/LTC2250 are 10-bit 125Msps/105Msps,
low noise 3V A/D converters designed for digitizing high
frequency, wide dynamic range signals. The LTC2251/
LTC2250 are perfect for demanding imaging and commu-
nications applications with AC performance that includes
61.6dB SNR and 85dB SFDR for signals at the Nyquist
frequency.
DC specs include ±0.1LSB INL (typ), ±0.05LSB DNL (typ)
and ±0.6LSB INL, ±0.6LSB DNL over temperature. The
transition noise is a low 0.08LSBRMS.
A single 3V supply allows low power operation. A separate
output supply allows the outputs to drive 0.5V to 3.3V
logic.
A single-ended CLK input controls converter operation. An
optional clock duty cycle stabilizer allows high perfor-
mance at full speed for a wide range of clock duty cycles.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
REFH
REFL
ANALOG
INPUT
FLEXIBLE
REFERENCE
+
INPUT
S/H
–
CLOCK/DUTY
CYCLE
CONTROL
CLK
10-BIT
PIPELINED
ADC CORE
CORRECTION
LOGIC
OUTPUT
DRIVERS
OVDD
D9
•
•
•
D0
OGND
22510 TA01
LTC2251: SNR vs Input Frequency,
–1dB, 2V Range, 125Msps
65
64
63
62
61
60
59
58
57
56
55
0
50 100 150 200 250 300 350
INPUT FREQUENCY (MHz) 22510 G09
22510fa
1
1 page  
LTC2251/LTC2250
POWER REQUIRE E TS The ● denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. (Note 8)
SYMBOL
PARAMETER
CONDITIONS
LTC2251
LTC2250
MIN TYP MAX MIN TYP MAX
UNITS
wwwV.dDaDtasheet4u.comAnalog Supply
Voltage
(Note 9)
● 2.85 3 3.4 2.85 3 3.4
V
OVDD
Output Supply
Voltage
(Note 9)
● 0.5 3 3.6 0.5 3 3.6
V
IVDD
PDISS
PSHDN
Supply Current
Power Dissipation
Shutdown Power
SHDN = H,
OE = H, No CLK
●
132 156
107 126
mA
●
395 468
320 378
mW
2 2 mW
PNAP
Nap Mode Power
SHDN = H,
OE = L, No CLK
15 15 mW
WU
TI I G CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL
fs
tL
tH
tAP
tD
Pipeline
Latency
PARAMETER
Sampling Frequency
CLK Low Time
CLK High Time
Sample-and-Hold
Aperture Delay
CLK to DATA Delay
Data Access Time
After OE↓
BUS Relinquish Time
CONDITIONS
(Note 9)
Duty Cycle Stabilizer Off
Duty Cycle Stabilizer On
(Note 7)
Duty Cycle Stabilizer Off
Duty Cycle Stabilizer On
(Note 7)
CL = 5pF (Note 7)
CL = 5pF (Note 7)
(Note 7)
LTC2251
LTC2250
MIN TYP MAX MIN TYP MAX
UNITS
●1
125 1
105 MHz
● 3.8 4 500 4.5 4.76 500
● 3 4 500 3 4.76 500
ns
ns
● 3.8 4 500 4.5 4.76 500
● 3 4 500 3 4.76 500
ns
ns
0 0 ns
● 1.4 2.7 5.4 1.4 2.7 5.4
● 4.3 10 4.3 10
ns
ns
●
3.3 8.5
3.3 8.5
ns
5 5 Cycles
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 ground with GND and OGND
wired together (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: VDD = 3V, fSAMPLE = 125MHz (LTC2251) or 105MHz (LTC2250),
input range = 2VP-P with differential drive, clock duty cycle stabilizer on,
unless otherwise noted.
Note 5: Integral nonlinearity is defined as the deviation of a code from a
straight line passing through the actual endpoints of the transfer curve.
The deviation is measured from the center of the quantization band.
Note 6: Offset error is the offset voltage measured from –0.5 LSB when
the output code flickers between 00 0000 0000 and 11 1111 1111.
Note 7: Guaranteed by design, not subject to test.
Note 8: VDD = 3V, fSAMPLE = 125MHz (LTC2251) or 105MHz (LTC2250),
input range = 1VP-P with differential drive.
Note 9: Recommended operating conditions.
22510fa
5
5 Page 
W
FUNCTIONAL BLOCK DIAGRA
LTC2251/LTC2250
AIN+
INPUT
www.datasAhINe– et4u.cSo/Hm
FIRST PIPELINED
ADC STAGE
SECOND PIPELINED
ADC STAGE
THIRD PIPELINED
ADC STAGE
FOURTH PIPELINED
ADC STAGE
FIFTH PIPELINED
ADC STAGE
SIXTH PIPELINED
ADC STAGE
VCM
2.2µF
1.5V
REFERENCE
RANGE
SELECT
SENSE
REF
BUF
SHIFT REGISTER
AND CORRECTION
REFH
REFL INTERNAL CLOCK SIGNALS
DIFF
CLOCK/DUTY
CONTROL
REF
CYCLE
LOGIC
AMP CONTROL
REFH 0.1µF REFL
2.2µF
1µF 1µF
CLK
MODE SHDN
OE
Figure 1. Functional Block Diagram
OUTPUT
DRIVERS
OVDD
OF
D9
•
•
•
D0
OGND
22510 F01
WU W
TI I G DIAGRA
ANALOG
INPUT
CLK
D0-D9, OF
tAP
N
tH N + 1
tL
N+2
N+3
N+4
N+5
tD
N–5
N–4
N–3
N–2
N–1
N
22510 TD01
22510fa
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC2251.PDF ] | |
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