MAX1195 datasheet(12/22 Pages) MAXIM | Dual, 8-Bit, 40Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs

Part #	MAX1195

Description	Dual, 8-Bit, 40Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs

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Manufacturer	MAXIM [Maxim Integrated Products]

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taneously with S1 sampling the input waveform.

Switches S4a, S4b, S5a, and S5b are then opened

before switches S3a and S3b connects capacitors C1a

and C1b to the output of the amplifier and switch S4c is

closed. The resulting differential voltages are held on

capacitors C2a and C2b. The amplifiers are used to

charge capacitors C1a and C1b to the same values

originally held on C2a and C2b. These values are then

presented to the first-stage quantizers and isolate the

pipelines from the fast-changing inputs. The wide input

bandwidth T/H amplifiers allow the MAX1195 to track

and sample/hold analog inputs of high frequencies

(>Nyquist). Both ADC inputs (INA+, INB+ and INA-,

INB-) can be driven either differentially or single-ended.

Match the impedance of INA+ and INA-, as well as

INB+ and INB-, and set the common-mode voltage to

mid-supply (VDD/2) for optimum performance.

Dual, 8-Bit, 40Msps, 3V, Low-Power ADC with

Internal Reference and Parallel Outputs

12

______________________________________________________________________________________

S3b

S3a

COM

S5b

S5a

INB+

INB-

S1

OUT

C2a

C2b

S4c

S4a

S4b

C1b

C1a

INTERNAL

BIAS

INTERNAL

BIAS

COM

HOLD

CLK

INTERNAL

NONOVERLAPPING

CLOCK SIGNALS

TRACK

S2a

S2b

S3b

S3a

COM

S5b

S5a

INA+

INA-

S1

OUT

C2a

C2b

S4c

S4a

S4b

C1b

C1a

INTERNAL

BIAS

INTERNAL

BIAS

COM

S2a

S2b

MAX1195

Figure 2. MAX1195 T/H Amplifiers

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