MAX1192 datasheet(16/28 Pages) MAXIM

16 / 28 page

Ultra-Low-Power, 22Msps, Dual 8-Bit ADC

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Input Track-and-Hold (T/H) Circuits

Figure 3 displays a simplified functional diagram of the

input T/H circuits. In track mode, switches S1, S2a,

S2b, S4a, S4b, S5a, and S5b are closed. The fully dif-

ferential circuits sample the input signals onto the two

capacitors (C2a and C2b) through switches S4a and

S4b. S2a and S2b set the common mode for the ampli-

fier input, and open simultaneously with S1, sampling

the input waveform. Switches S4a, S4b, S5a, and S5b

are then opened before switches S3a and S3b connect

capacitors C1a and C1b to the output of the amplifier

and switch S4c is closed. The resulting differential volt-

ages are held on capacitors C2a and C2b. The ampli-

fiers charge capacitors C1a and C1b to the same

S3b

S3a

COM

S5b

S5a

INB+

INB-

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-

OUT

C2a

C2b

S4c

S4a

S4b

C1b

C1a

INTERNAL

BIAS

INTERNAL

BIAS

COM

S2a

S2b

MAX1192

Figure 3. Internal T/H Circuits

MAX1192 Datasheet(PDF) 16 Page - Maxim Integrated Products

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