AD7452 Analog Devices, AD7452 Datasheet - Page 7

• Manufacturer Part Number: AD7452
• Description: Differential Input, 555 kSPS, 12-Bit A/D Converter in 8-Lead SOT-23
• Manufacturer: Analog Devices

Specifications of AD7452

• 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 AD7452. An external reference must be applied to this input. For a 5 V power supply, the reference is
2.5 V (± 1%) for specified performance. For a 3 V power supply, the reference is 2 V (± 1%) for specified performance. This pin
should be decoupled to GND with a capacitor of at least 0.1 µF. See the Reference section for more details.
Positive Terminal for Differential Analog Input.
Negative Terminal for Differential Analog Input.
Analog Ground. Ground reference point for all circuitry on the AD7452. 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 AD7452 and
framing the serial data transfer.
Serial Data. Logic output. The conversion result from the AD7452 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 consists of four leading zeros followed by the 12 bits of
conversion data, which are provided MSB first. The output coding is twos complement.
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
and a 10 µF tantalum capacitor in parallel.
DD
is 3 V (+20%/–10%) or 5 V (± 5%). This supply should be decoupled to GND with a 0.1 µF capacitor
Figure 4. 8-Lead SOT-23 Pin Configuration
SDATA
SCLK
V
CS
DD
Rev. B | Page 7 of 28
1
2
3
4
(Not to Scale)
AD7452
TOP VIEW
8
7
6
5
V
V
V
GND
REF
IN+
IN–
AD7452