LTC2225 LINER [Linear Technology], LTC2225 Datasheet - Page 8

• Manufacturer Part Number: LTC2225
• Description: 12-Bit, 10Msps Low Power 3V ADC
• Manufacturer: LINER [Linear Technology]

PI FU CTIO S
SENSE (Pin 30): Reference Programming Pin. Connecting
SENSE to V
input range. V
input range. An external reference greater than 0.5V and
less than 1V applied to SENSE selects an input range of
±V
FUNCTIONAL BLOCK DIAGRA
LTC2225
8
SENSE
SENSE
U
2.2µF
U
A
A
V
IN
IN
CM
+
–
. ±1V is the largest valid input range.
U
INPUT
REFERENCE
CM
S/H
SELECT
RANGE
1.5V
DD
U
selects the internal reference and a ±0.5V
selects the internal reference and a ±1V
U
REF
BUF
FIRST PIPELINED
ADC STAGE
AMP
SECOND PIPELINED
DIFF
REF
ADC STAGE
1µF
Figure 1. Functional Block Diagram
REFH
REFH
W
0.1µF
2.2µF
REFL
THIRD PIPELINED
REFL
ADC STAGE
1µF
INTERNAL CLOCK SIGNALS
V
Bypass to ground with 2.2µF ceramic chip capacitor.
GND (Exposed Pad) (Pin 33): ADC Power Ground. The
exposed pad on the bottom of the package needs to be
soldered to ground.
CM
CLOCK/DUTY
CONTROL
(Pin 31): 1.5V Output and Input Common Mode Bias.
CYCLE
CLK
FOURTH PIPELINED
ADC STAGE
MODE
CONTROL
LOGIC
SHDN
FIFTH PIPELINED
ADC STAGE
OE
AND CORRECTION
SHIFT REGISTER
SIXTH PIPELINED
DRIVERS
OUTPUT
ADC STAGE
OGND
2225 F01
2225fa
OV
OF
D11
D0
•
•
•
DD