ADC141S626 Datasheet, PDF (1/29 Pages) National Semiconductor (TI) – 14-Bit, 50 kSPS to 250 kSPS, Differential Input, Micro Power A/D Converter

ADC141S626
www.ti.com
SNAS434B – NOVEMBER 2007 – REVISED MARCH 2013
ADC141S626 14-Bit, 50 kSPS to 250 kSPS, Differential Input, Micro Power A/D Converter
Check for Samples: ADC141S626
FEATURES
1
•2 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
APPLICATIONS
• Automotive Navigation
• Portable Systems
• Medical Instruments
• Instrumentation and Control Systems
• Motor Control
• Direct Sensor Interface
KEY SPECIFICATIONS
• Conversion Rate: 50 kSPS to 250 kSPS
• INL: ± 0.95 LSB (Max)
• DNL: ± 0.95 LSB (Max)
• SNR: 82 dBc (Max)
• THD: -90 dBc (Typ)
• ENOB: 13.3 Bits(Min)
• Power Consumption:
– 200 kSPS, 3V: 2.0 mW (Typ)
– 250 kSPS, 5V: 4.8 mW (Typ)
– Power-Down, 3V: 4 µW (Typ)
– Power-Down, 5V: 13 µW (Typ)
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 (SAR) architecture where the differential
nature of the analog inputs is maintained from the
internal sample-and-hold circuits throughout the A/D
converter to provide excellent common-mode signal
rejection. The ADC141S626 features an external
reference that can be varied from 1.0V to V_A. It also
features 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 compatible with several standards, such as SPI™,
QSPI™, MICROWIRE, 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; thus, ADC141S626
has no latency.
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 minimize power
consumption by operating the analog portion of the
ADC at a V_A of 5V while communicating with a 3V
controller on the digital side. With a 3V source, the
power consumption when operating at 200 kSPS is
2.0 mW. With a 5V source, the power consumption
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 (power-down) mode. The differential 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
VSSOP package.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007–2013, Texas Instruments Incorporated