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TSA7887BRZ-REEL bảng dữ liệu(PDF) 7 Page - Silicon Laboratories

tên linh kiện TSA7887BRZ-REEL
Giải thích chi tiết về linh kiện  A Micropower, 2-channel, 125-ksps, Serial-Output 12-bit SAR ADC
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TSA7887
TSA7887 Rev. 1.0
Page 7
PIN FUNCTIONS
PIN
LABEL
DESCRIPTION
1
CS
Chip Select: As an active low logic input signal, the CS input provides the dual function of
initiating TSA7887 conversions as well as framing the serial data transfer. When the
TSA7887 is operated in Mode 1(its default power management mode), the CS pin also
acts as the shutdown pin in that the TSA7887 is powered-down when the CS pin is logic
high.
2
VDD
Power Supply Voltage: The TSA7887’s VDD range +2.7V to +5.25V. In two-channel
operation, the VDD pin also serves as the TSA7887’s voltage reference source during
conversions. For optimal performance, the VDD pin should be bypassed to GND with a
10-µF tantalum capacitor in parallel with a 0.1µF ceramic capacitor.
3
GND
Analog Ground Pin: The GND pin is the ground reference point for all TSA7887 internal
circuitry. In systems with separate AGND and DGND planes, the TSA7887’s GND pin
should be connected to the AGND plane.
4
AIN1/VREF
Analog Input Channel 1/External VREF Input: In single-channel mode, the AIN1/VREF pin
is configured as VREFIN/OUT. In this mode, the TSA7887’s internal 2.5V reference can be
accessed or an external reference can be applied to this pin thereby overriding the internal
reference. The reference voltage range for an externally-applied reference is 1.2V to VDD.
In two-channel mode, the AIN1/VREF pin operates as a second analog input channel,
AIN1. The input voltage range on AIN1 is 0 to VDD.
5
AIN0
Analog Input Channel 0: In single-channel operation, AIN0 is the TSA7887’s analog input
with an input voltage range of 0V to VREF. In two-channel operation, the AIN0 pin exhibits
an analog input range of 0V to VDD.
6
DIN
Serial Data Input: Serial data to be loaded into the TSA7887’s control register is applied at
the DIN pin. Serial data is loaded into the ADC from the host processor on low-to-high
SCLK transitions (see the Control Register section for additional information). Configuring
the TSA7887 as a single-channel, read-only ADC can be achieved by hard-wiring the DIN
pin to GND or by applying a logic LOW at all times at the DIN pin.
7
DOUT
Serial Data Output: The TSA7887’s conversion result is available on this pin. Serial data is
transferred out of the TS7887 on high-to low transitions of SCLK. The 12-bit conversion
result is comprised of four leading zeros followed by the 12 bits of conversion data
formatted MSB first. Thus, a total of 16 SCLK high-to-low transitions transfers the
conversion result to the host processor as shown in the corresponding timing diagram of
Figure 14.
8
SCLK
Serial-Clock Input: SCLK is used for (3) purposes: a) to load serial data from the host
processor into the TSA7887’s control register on low-to-high SCLK transitions; b) to
transfer the 12-bit conversion result to the host processor on high-to-low SCLK transitions;
and c) to control the TSA7887’s conversion process.


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