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LTC2288UP Datasheet(PDF) 11 Page - Linear Technology

Part # LTC2288UP
Description  Dual 10-Bit, 65/40/25Msps Low Noise 3V ADCs
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC2288UP Datasheet(HTML) 11 Page - Linear Technology

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LTC2288/LTC2287/LTC2286
11
228876f
PI FU CTIO S
AINA+ (Pin 1): Channel A Positive Differential Analog
Input.
AINA– (Pin 2): Channel A Negative Differential Analog
Input.
REFHA (Pins 3, 4): Channel A High Reference. Short
together and bypass to Pins 5, 6 with a 0.1µF ceramic chip
capacitor as close to the pin as possible. Also bypass to
Pins 5, 6 with an additional 2.2µF ceramic chip capacitor
and to ground with a 1µF ceramic chip capacitor.
REFLA (Pins 5, 6): Channel A Low Reference. Short
together and bypass to Pins 3, 4 with a 0.1µF ceramic chip
capacitor as close to the pin as possible. Also bypass to
Pins 3, 4 with an additional 2.2µF ceramic chip capacitor
and to ground with a 1µF ceramic chip capacitor.
VDD (Pins 7, 10, 18, 63): Analog 3V Supply. Bypass to
GND with 0.1µF ceramic chip capacitors.
CLKA (Pin 8): Channel A Clock Input. The input sample
starts on the positive edge.
CLKB (Pin 9): Channel B Clock Input. The input sample
starts on the positive edge.
REFLB (Pins 11, 12): Channel B Low Reference. Short
together and bypass to Pins 13, 14 with a 0.1µF ceramic
chip capacitor as close to the pin as possible. Also bypass
to Pins 13, 14 with an additional 2.2µF ceramic chip ca-
pacitor and to ground with a 1µF ceramic chip capacitor.
REFHB (Pins 13, 14): Channel B High Reference. Short
together and bypass to Pins 11, 12 with a 0.1µF ceramic
chip capacitor as close to the pin as possible. Also bypass
to Pins 11, 12 with an additional 2.2µF ceramic chip ca-
pacitor and to ground with a 1µF ceramic chip capacitor.
AINB– (Pin 15): Channel B Negative Differential Analog
Input.
AINB+ (Pin 16): Channel B Positive Differential Analog
Input.
GND (Pins 17, 64): ADC Power Ground.
SENSEB (Pin 19): Channel B Reference Programming Pin.
Connecting SENSEB to VCMB selects the internal reference
and a ±0.5V input range. VDD selects the internal reference
and a ±1V input range. An external reference greater than
0.5V and less than 1V applied to SENSEB selects an input
range of ±VSENSEB. ±1V is the largest valid input range.
VCMB (Pin 20): Channel B 1.5V Output and Input Common
Mode Bias. Bypass to ground with 2.2µF ceramic chip
capacitor. Do not connect to VCMA.
LTC2286: IOVDD vs Sample Rate,
5MHz Sine Wave Input, –1dB,
OVDD = 1.8V
LTC2286: IVDD vs Sample Rate,
5MHz Sine Wave Input, –1dB
LTC2286: SFDR vs Input Level,
fIN = 5MHz, 2V Range, 25Msps
TYPICAL PERFOR A CE CHARACTERISTICS
SAMPLE RATE (Msps)
228876 G45
70
60
50
40
30
0
10
20
515
25
30
35
2V RANGE
1V RANGE
0
10
20
515
25
30
35
SAMPLE RATE (Msps)
228876 G46
6
4
2
0
INPUT LEVEL (dBFS)
–60
0
20
40
60
80
120
–50
–40
–30
dBFS
dBc
–20
228876 G44
–10
0
100
10
30
50
70
110
90
80dBc SFDR
REFERENCE LINE


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