ADC141S625_14 Datasheet, PDF (1/27 Pages) Texas Instruments – 14-Bit, 50 kSPS to 250 kSPS, Differential Input, Micro Power A/D Converter

ADC141S625
www.ti.com
SNAS434A – NOVEMBER 2007 – REVISED JANUARY 2009
ADC141S626 14-Bit, 50 kSPS to 250 kSPS, Differential Input, Micro Power A/D Converter
Check for Samples: ADC141S625
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
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 MSOP package.
Conversion Rate
INL
DNL
SNR
THD
ENOB
Power Consumption
Table 1. Key Specifications
VALUE
50 kSPS to 250
kSPS
± 0.95
± 0.95
82
− 90
13.3
UNIT
LSB (max)
LSB (max)
dBc (max)
dBc (typ)
bits (min)
200 kSPS, 3V 2.0
mW (typ)
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 © 2007–2009, Texas Instruments Incorporated