TSA7887
A Micropower, 2-channel, 125-ksps, Serial-Output 12-bit SAR ADC
FEATURES
DESCRIPTION
Alternate Source for AD7887
Single-supply Operation: +2.7V to +5.25V
INL: ±1LSB - TSA7887B
±2LSBs - TSA7887A
One or Two Single-ended Analog Inputs
Internal Wide-bandwidth Track-and-Hold
Internal +2.5-V Reference
Flexible Power/Throughput-Rate Management
0.85mA at 125ksps (Internal VREF ON)
0.7mA at 125ksps (Internal VREF OFF)
Shutdown-mode Supply Current: 1μA (max)
SPI®/QSPI™/MICROWIRE™/DSP-Compatible
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Serial Interfaces
Operating Temperature Range:
-40ºC to +125ºC
8-pin SOIC and MSOP Packaging
The TSA7887 – an alternate source for the AD7887 -
is
a
self-contained,
2-channel,
high-speed,
micropower, 12-bit analog-to-digital converter (ADC)
that operates from a single +2.7V to +5.25V power
supply. The TSA7887 is capable of a 125-ksps
throughput rate with an external 2MHz serial clock
and draws 0.85mA supply current.
The wideband input track-and-hold acquires signals
in 500ns and features a single-ended sampling
topology. Output data coding is straight binary and
the ADC is capable of converting full power signals
up to 2.5 MHz. The ADC also contains an integrated
2.5V reference or the VREF pin can be overdriven by
an external reference.
The TSA7887’s provides one or two analog inputs
each with an analog input range from 0 to V
REF
. In
two-channel operation, the analog input range is 0V
to VDD. Efficient circuit design ensures low power
consumption of 2mW (typical) for normal operation
and 3μW in power-down operation.
The TSA7887 is fully specified from -40ºC to +125ºC
and is available in 8-pin SOIC and MSOP packages.
APPLICATIONS
Instrumentation and Control Systems
High-Speed Modems
Battery-powered systems:
Personal Digital Assistants, Medical
Instruments, Mobile Communications
FUNCTIONAL BLOCK DIAGRAM
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SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National
Semiconductor Corporation
The Touchstone Semiconductor logo is a registered trademark of
Touchstone Semiconductor, Incorporated.
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