LTC1199_15 Datasheet, PDF (1/28 Pages) Linear Technology – 10-Bit, 500ksps ADCs in MSOP with Auto Shutdown

FEATURES
s _{8-Pin MSOP and SO Packages}
s _{10-Bit Resolution at 500ksps}
s _{Single Supply: 5V or 3V}
s _{Low Power at Full Speed:}
25mW Typ at 5V
2.2mW Typ at 2.7V
s _{Auto Shutdown Reduces Power Linearly}
at Lower Sample Rates
s _{10-Bit Upgrade to 8-Bit LTC1196/LTC1198}
s _{SPI and MICROWIRE}^TM _{Compatible Serial I/O}
s _{Low Cost}
U
APPLICATIO S
s _{High Speed Data Acquisition}
s _{Portable or Compact Instrumentation}
s _{Low Power or Battery-Operated Instrumentation}
LTC1197/LTC1197L
LTC1199/LTC1199L
10-Bit, 500ksps ADCs in
MSOP with Auto Shutdown
DESCRIPTIO
The LTC^®1197/LTC1197L/LTC1199/LTC1199L are
10-bit A/D converters with sampling rates up to 500kHz.
They have 2.7V (L) and 5V versions and are offered in
8-pin MSOP and SO packages. Power dissipation is typi-
cally only 2.2mW at 2.7V (25mW at 5V) during full speed
operation. The automatic power down reduces supply
current linearly as sample rate is reduced. These 10-bit,
switched-capacitor, successive approximation ADCs in-
clude a sample-and-hold. The LTC1197/LTC1197L have a
differential analog input with an adjustable reference pin.
The LTC1199/LTC1199L offer a software-selectable
2-channel MUX.
The 3-wire serial I/O, MSOP and SO-8 packages, 2.7V
operation and extremely high sample rate-to-power ratio
make these ADCs ideal choices for compact, low power
high speed systems.
These circuits 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 (LTC1197/LTC1197L) allow direct connec-
tion to signal sources in many applications, eliminating
the need for gain stages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
TYPICAL APPLICATIO
Single 2.7V Supply, 250ksps, 10-Bit Sampling ADC
1µF
2.7V
1
2
ANALOG INPUT
0V TO 2.7V RANGE ³
4
LTC1197L
CS
V_CC
+IN CLK
– IN D_OUT
GND V_REF
8
7
6
5
1197/99 TA01
SERIAL DATA LINK TO
ASIC, PLD, MPU, DSP
OR SHIFT REGISTERS
Supply Current vs Sampling Frequency
10000
1000
100
V_CC = 5V
f_CLK = 7.2MHz
10
V_CC = 2.7V
f_CLK = 3.5MHz
1
0.1
0.01
0.1
1
10 100
SAMPLING FREQUENCY (kHz)
1000
1197/99 G03
1