LTC1854_15 Datasheet, PDF (1/24 Pages) Linear Technology – 8-Channel, 10V Input 12-/14-/16-Bit, 100ksps ADC Converters with Shutdown

Features
n _{Single 5V Supply}
n _{Sample Rate: 100ksps}
n _{8-Channel Multiplexer with ±30V Protection}
n _{±10V Bipolar Input Range}
Single Ended or Differential
n _{±3LSB INL for the LTC1856, ±1.5LSB INL for the}
LTC1855, ±1LSB INL for the LTC1854
n _{Power Dissipation: 40mW (Typ)}
n _{SPI/MICROWIRE™ Compatible Serial I/O}
n _{Power Shutdown: Nap and Sleep}
n _{SINAD: 87dB (LTC1856)}
n _{Operates with Internal or External Reference}
n _{Internal Synchronized Clock}
n _{28-Pin SSOP Package}
Applications
n _{Industrial Process Control}
n _{Multiplexed Data Acquisition Systems}
n _{High Speed Data Acquisition for PCs}
n _{Digital Signal Processing}
LTC1854/LTC1855/LTC1856
8-Channel, ±10V Input
12-/14-/16-Bit, 100ksps ADC
Converters with Shutdown
Description
The LTC^®1854/LTC1855/LTC1856 are 8-channel, low
power, 12-/14-/16-bit, 100ksps, analog-to-digital con-
verters (ADCs). These ADCs operate from a single 5V
supply and the 8‑channel multiplexer can be programmed
for single-ended inputs, pairs of differential inputs, or
combinations of both. In addition, all channels are fault
protected to ±30V. A fault condition on any channel will not
affect the conversion result of the selected channel.
An onboard precision reference minimizes external com-
ponents. Power dissipation is 40mW at 100ksps and lower
in two power shutdown modes (27.5mW in Nap mode and
40µW in Sleep mode.) DC specifications include ±3LSB
INL for the LTC1856, ±1.5LSB INL for the LTC1855 and
±1LSB for the LTC1854.
The internal clock is trimmed for 5µs maximum conversion
time and the sampling rate is guaranteed at 100ksps. A
separate convert start input and data ready signal (BUSY)
ease connections to FIFOs, DSPs and microprocessors.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Typical Application
100kHz, 12-Bit/14-/16-Bit Sampling ADC
SOFTWARE-PROGRAMMABLE
SINGLE-ENDED OR
DIFFERENTIAL INPUTS
±10V BIPOLAR INPUT RANGE
COM
CONVST
CH0 _LTC1854/ RD
CH1 LTC1855/ SCK
CH2 ^LTC1856 SDI
CH3
DGND
CH4
SDO
CH5
BUSY
CH6
OV_DD
CH7
MUXOUT⁺
MUXOUT^–
DV_DD
AV_DD
AGND3
ADC⁺
AGND2
ADC^–
REFCOMP
AGND1
V_REF
µP
CONTROL
LINES
0.1µF 10µF 10µF 0.1µF 10µF
1µF
10µF
0.1µF
3V TO 5V
5V
5V
0.1µF
2.5V
LTC1856 Typical INL Curve
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–32768 –16384
0
CODE
16384 32767
185456 G01
1854565af
1