ADC141S626 Datasheet, PDF (1/20 Pages) National Semiconductor (TI) – 14-Bit, 50 kSPS to 250 kSPS, Differential Input, Micro Power A/D Converter

November 30, 2007
ADC141S626
14-Bit, 50 kSPS to 250 kSPS, Differential Input, Micro Power
A/D Converter
General Description
The ADC141S626 is a 14-bit, 50 kSPS to 250 kSPS sampling
Analog-to-Digital (A/D) converter. The converter is based on
a successive-approximation register architecture where the
differential nature of the analog inputs is maintained from the
internal track-and-hold circuits throughout the A/D converter
to provide excellent common-mode signal rejection. The
ADC141S626 features an external reference that can be var-
ied from 1.0V to V_A and a zero-power track mode where the
ADC is consuming the minimum amount of supply current
while the internal sampling capacitor is tracking the applied
analog input voltage.
The serial data output is binary 2's complement and is com-
patible with several standards, such as SPI™, QSPI™, MI-
CROWIRE™, and many common DSP serial interfaces. The
conversion result is clocked out by the serial clock input and
is the result of the conversion currently in progress.
The ADC141S626 may be operated with independent analog
(V_A) and digital input/output (V_IO) supplies. V_A and V_IO can
range from 2.7V to 5.5V and can be set independent of each
other. This allows a user to maximize performance and min-
imize power consumption by operating the analog portion of
the ADC at a V_A of 5V while communicating with a 3V con-
troller on the digital side. Operating from a single 3V supply,
the power consumption when operating at 200 kSPS is 2.0
mW. While operating from a single 5V supply, the power con-
sumption when operating at 250 kSPS is 4.8 mW. The power
consumption drops down to 4 µW and 13 µW respectively
when the ADC141S626 enters acquisition mode. The differ-
ential input, low power consumption, and small size make the
ADC141S626 ideal for direct connection to bridge sensors
and transducers in battery operated systems or remote data
acquisition applications.
Operation is guaranteed over the temperature range of −40°
C to +85°C and clock rates of 0.9 MHz to 4.5 MHz. The
ADC141S626 is available in a 10-lead MSOP package.
Features
■ ^{True Differential Inputs}
■ ^{Guaranteed performance from 50 kSPS to 250 kSPS}
■ ^{External Reference}
■ ^{Zero-Power Track Mode}
■ ^{Wide Input Common-Mode Voltage Range}
■ ^{Operating Temperature Range of −40°C to +85°C}
■ ^{SPI™/QSPI™/MICROWIRE™/DSP compatible Serial}
Interface
Key Specifications
■ ^{Conversion Rate}
■ ^INL
■ ^DNL
■ ^SNR
■ ^THD
■ ^ENOB
■ ^{Power Consumption}
■ — ^{200 kSPS, 3V}
— 250 kSPS, 5V
— Power-Down, 3V
— Power-Down, 5V
50 kSPS to 250 kSPS
± 0.95 LSB (max)
± 0.95 LSB (max)
82 LSB (max)
− 90 dBc (typ)
13.3 bits (min)
2.0 mW (typ)
4.8 mW (typ)
4 µW (typ)
13 µW (typ)
Applications
■ ^{Automotive Navigation}
■ ^{Portable Systems}
■ ^{Medical Instruments}
■ ^{Instrumentation and Control Systems}
■ ^{Motor Control}
■ ^{Direct Sensor Interface}
Connection Diagram
TRI-STATE® is a trademark of National Semiconductor Corporation.
MICROWIRE™ is a trademark of National Semiconductor Corporation.
QSPI™ and SPI™ are trademarks of Motorola, Inc.
© 2007 National Semiconductor Corporation 300413
30041305
www.national.com