LTC1196 Datasheet, PDF (1/28 Pages) Linear Technology – 8-Bit, SO-8, 1MSPS ADCs with Auto-Shutdown Options

LTC1196/LTC1198
8-Bit, SO-8, 1MSPS ADCs with
Auto-Shutdown Options
FEATURES
s _{High Sampling Rates: 1MHz (LTC1196)}
750kHz (LTC1198)
s _{Low Cost}
s _{SO-8 Plastic Package}
s _{Single Supply 3V and 5V Specifications}
s _{Low Power: 10mW at 3V Supply}
50mW at 5V Supply
s _{Auto-Shutdown: 1nA Typical (LTC1198)}
s _{±1/2LSB Total Unadjusted Error over Temperature}
s _{3-Wire Serial I/O}
s _{1V to 5V Input Span Range (LTC1196)}
s _{Converts 1MHz Inputs to 7 Effective Bits}
s _{Differential Inputs (LTC1196)}
s _{2-Channel MUX (LTC1198)}
APPLICATI S
s _{High Speed Data Acquisition}
s _{Disk Drives}
s _{Portable or Compact Instrumentation}
s _{Low Power or Battery-Operated Systems}
DESCRIPTIO
The LTC1196/LTC1198 are 600ns, 8-bit A/D converters
with sampling rates up to 1MHz. They are offered in 8-pin
SO packages and operate on 3V to 6V supplies. Power
dissipation is only 10mW with a 3V supply or 50mW with
a 5V supply. The LTC1198 automatically powers down to
a typical supply current of 1nA whenever it is not perform-
ing conversions. These 8-bit switched-capacitor succes-
sive approximation ADCs include sample-and-holds. The
LTC1196 has a differential analog input; the LTC1198
offers a software selectable 2-channel MUX.
The 3-wire serial I/O, SO-8 packages, 3V operation and
extremely high sample rate-to-power ratio make these
ADCs an ideal choice for compact, high speed systems.
These ADCs can be used in ratiometric applications or with
external references. The high impedance analog inputs
and the ability to operate with reduced spans below 1V full
scale (LTC1196) allow direct connection to signal sources
in many applications, eliminating the need for gain stages.
The A grade devices are specified with total unadjusted
error of ±1/2LSB maximum over temperature.
TYPICAL APPLICATI
Single 5V Supply, 1MSPS, 8-Bit Sampling ADC
1µF 5V
ANALOG INPUT
0V TO 5V RANGE
1 _CS
8
V_CC
2
7
+IN LTC1196 CLK
3
(SO-8)
6
–IN
D_OUT
4 _GND
5
V_REF
SERIAL DATA LINK TO
ASIC, PLD, MPU, DSP,
OR SHIFT REGISTERS
1196/98 TA01
Effective Bits and S/(N + D) vs Input Frequency
8
50
7
V_REF = V_CC = 2.7V
f_SMPL = 383kHz (LTC1196)
44
f_SMPL = 287kHz (LTC1198)
6
V_REF = V_CC = 5V
5
f_SMPL = 1MHz (LTC1196)
f_SMPL = 750kHz (LTC1198)
4
3
2
1
T_A = 25°C
0
1k
10k
100k
INPUT FREQUENCY (Hz)
1M
1196/98 G24
1