DATA SHEET
D
LND3045
Analog Sensor Interface Chip- SAR ADC with SPI
Interface, Speed Sensor & PTAT
GENERAL DESCRIPTION
LND3045 is an analog chip prototype, which consists of
five 12-bit and one 16-bit Successive Approximation
Register (SAR) analog-to-digital converters (ADC) with
SPI Interface, a speed sensor and a Proportional To
Absolute Temperature (PTAT) circuit. LND3045 provides
a complete front-end solution for high temperature
sensor applications including LVDTs and Resolvers.
Analog input range to SAR ADC can vary from V
DD
to
V
SS
. ADC normally remains in shutdown mode, powering
up only for the conversions. This process of conversion
is controlled by enable pin of the ADC and this results in
a lot of power saving.
All the bias voltages required for proper functioning of
various internal components are generated inside the
chip which eliminates the use of external voltage
references.
LND3045 provides a serial interface, which is compatible
with SPI. Proportional to absolute temperature (PTAT)
circuit acts as a temperature sensor that monitors the
ambient temperature. Output of PTAT circuit is
connected to one of the 12-bit SAR ADC. Speed sensor
generates a pulse each time when a peak is detected in
the applied differential input.
LND3045 is available in a 48-pin DIP package, and it
o
o
operates over a temperature range of 27 C to 200 C.
FEATURES
Complete Frond-End for LVDTs and
Resolvers up to 16-bit data collection
Includes four 12-bit resolution SAR
ADCs and one 16-bit resolution SAR
ADC with differential inputs
On-chip bias voltage references
Built-in PTAT which acts as
temperature sensor
SPI standard interface
o
Operating temperature range of 27 C to
o
200 C
Clock Speed of 1MHz or Higher
Maximum power dissipation of 23 mW
under a supply voltage of 3.3V
48-pin DIP package
Excellent Monotonicity and Linearity
over Temperature
APPLICATIONS
LVDT & Resolver Front-End Interface
Digital Signal Processing
Industrial Process Control
Battery Powered Systems
PRODUCT HIGHLIGHTS
Five analog differential input channels
for SAR ADCs
SPI serial interface
On-chip temperature sensor
Bias voltages derived inside the chip
Temperature insensitive operation
Linear Dimensions, Inc.
445 East Ohio Street, Chicago IL 60611 USA
tel 312.404.9283
fax 312.321.1830
LINEAR_DIMENSIONS [ LINEAR DIMENSIONS SEMICONDUCTOR ]
