LTC1098 LINER [Linear Technology], LTC1098 Datasheet - Page 12

• Manufacturer Part Number: LTC1098
• Description: Micropower Sampling 8-Bit Serial I/O A/D Converters
• Manufacturer: LINER [Linear Technology]

LTC1096/LTC1096L
LTC1098/LTC1098L
OVERVIEW
The LTC1096/LTC1096L/LTC1098/LTC1098L are 8-bit
micropower, switched-capacitor A/D converters. These
sampling ADCs typically draw 120 A of supply current
when sampling up to 33kHz. Supply current drops linearly
as the sample rate is reduced (see Supply Current vs
Sample Rate on the first page of this data sheet). The ADCs
automatically power down when not performing conver-
sion, drawing only leakage current. They are packaged in
8-pin SO packages. The LTC1096L/LTC1098L operate on
a single supply ranging from 2.65V to 4V. The LTC1096
operates on a single supply ranging from 3V to 9V while
the LTC1098 operates from 3V to 6V supplies.
The LTC1096/LTC1096L/LTC1098/LTC1098L comprise
an 8-bit, switched-capacitor ADC, a sample-and-hold and
12
TEST CIRCUITS
A
PPLICATI
D
D
CLK
LTC1096/LTC1096L
D
OUT
CS
CLK
OUT
CS
IN
O
LTC1098/LTC1098L
U
S
I FOR ATIO
U
1
W
START
2
Voltage Waveforms for t
U
3
t
WAKEUP
a serial port (see Block Diagram). Although they share the
same basic design, the LTC1096(L) and LTC1098(L) differ
in some respects. The LTC1096(L) has a differential input
and has an external reference input pin. It can measure
signals floating on a DC common mode voltage and can
operate with reduced spans down to 250mV. Reducing the
span allows it to achieve 1mV resolution. The LTC1098(L)
has a 2-channel input multiplexer and can convert either
channel with respect to ground or the difference between
the two.
SERIAL INTERFACE
The LTC1098(L) communicates with microprocessors
and other external circuitry via a synchronous, half duplex,
4-wire serial interface while the LTC1096(L) uses a 3-wire
interface (see Operating Sequence in Figures 1 and 2).
4
en
5
1
t
t
en
en
V
V
OL
OL
B7
LTC1096/98 • TC08
B7
LTC1096/98 • TC07