
LTC2258-12
LTC2257-12/LTC2256-12
17
225812fd
FuncTional block DiagraM
Figure 1. Functional Block Diagram
DIFF
REF
AMP
REF
BUF
2.2F
0.1F
INTERNAL CLOCK SIGNALS
REFH
REFL
CLOCK/DUTY
CYCLE
CONTROL
RANGE
SELECT
1.25V
REFERENCE
FIRST PIPELINED
ADC STAGE
FIFTH PIPELINED
ADC STAGE
FOURTH PIPELINED
ADC STAGE
SECOND PIPELINED
ADC STAGE
ENC+
ENC–
SHIFT REGISTER
AND CORRECTION
SDO
CS
OGND
OF
OVDD
D11
CLKOUT–
CLKOUT+
D0
225812 F01
INPUT
S/H
SENSE
VREF
AIN–
AIN+
1F
VCM
0.1F
VDD/2
THIRD PIPELINED
ADC STAGE
OUTPUT
DRIVERS
MODE
CONTROL
REGISTERS
SCK
PAR/SER
SDI
VDD
GND