AD7453 Analog Devices, AD7453 Datasheet - Page 7

• Manufacturer Part Number: AD7453
• Description: Pseudo Differential, 555 kSPS, 12-Bit A/D Converter in 8-Lead SOT-23
• Manufacturer: Analog Devices

Specifications of AD7453

• Resolution (bits): 12bit
• # Chan: 1
• Sample Rate: 555kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (2Vref) p-p
• Adc Architecture: SAR
• Pkg Type: SOT

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 4. Pin Function Descriptions
Mnemonic
V
V
V
GND
CS
SDATA
SCLK
V
REF
IN+
IN–
DD
Function
Reference Input for the AD7453. An external reference in the range 100 mV to V
reference input is 2.5 V. This pin should be decoupled to GND with a capacitor of at least 0.1 µF.
Noninverting Analog Input.
Inverting Input. This pin sets the ground reference point for the V
pseudo ground.
Analog Ground. Ground reference point for all circuitry on the AD7453. All analog input signals and any external reference
signal should be referred to this GND voltage.
Chip Select. Active low logic input. This input provides the dual function of initiating a conversion on the AD7453 and
framing the serial data transfer.
Serial Data. Logic output. The conversion result from the AD7453 is provided on this output as a serial data stream. The bits
are clocked out on the falling edge of the SCLK input. The data stream of the AD7453 consists of four leading zeros followed
by the 12 bits of conversion data that are provided MSB first. The output coding is straight (natural) binary.
Serial Clock. Logic input. SCLK provides the serial clock for accessing data from the part. This clock input is also used as the
clock source for the conversion process.
Power Supply Input. V
tantalum capacitor.
DD
is 2.7 V to 5.25 V. This supply should be decoupled to GND with a 0.1 µF capacitor and a 10 µF
SDATA
Figure 4. Pin Function Descriptions
SCLK
V
CS
DD
Rev. B | Page 7 of 20
1
2
3
4
(Not to Scale)
AD7453
TOP VIEW
8
7
6
5
V
V
V
GND
IN+
REF
IN+
IN–
input. Connect to ground or to a dc offset to provide a
DD
must be applied to this input. The specified
AD7453