AD7653AST Analog Devices Inc, AD7653AST Datasheet - Page 16

• Manufacturer Part Number: AD7653AST
• Description: IC ADC 16BIT 1MSPS W/REF 48-LQFP
• Manufacturer: Analog Devices Inc
• Series: PulSAR®r

Specifications of AD7653AST

• Rohs Status: RoHS non-compliant
• Number Of Bits: 16
• Sampling Rate (per Second): 1M
• Data Interface: Serial, Parallel
• Number Of Converters: 1
• Power Dissipation (max): 145mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• For Use With: EVAL-AD7653CBZ - BOARD EVALUATION FOR AD7653

AD7653
Transfer Functions
Using the OB/ 2C digital input, the AD7653 offers two output
codings: straight binary and twos complement. The LSB size is
V
transfer characteristic is shown in
REF
/65536, which is about 38.15 µV. The AD7653’s ideal
111...111
111...110
111...101
000...010
000...001
000...000
ANALOG INPUT
(0V TO 2.5V)
ANALOG
0.5 LSB
SUPPLY
0V
Figure 21. ADC Ideal Transfer Function
(5V)
1 LSB = V
1 LSB
C
NOTES
1
2
3
4
U1
SEE VOLTAGE REFERENCE INPUT SECTION.
THE CONFIGURATION SHOWN IS USING THE INTERNAL REFERENCE AND INTERNAL BUFFER.
THE AD8021 IS RECOMMENDED. SEE DRIVER AMPLIFIER CHOICE SECTION.
OPTIONAL LOW JITTER.
A 10 µ F CERAMIC CAPACITOR (X5R, 1206 SIZE) IS RECOMMENDED (e.g., PANASONIC ECJ3YB0J106M).
R
REF
4
2
/65536
ANALOG INPUT
C
+
C
15Ω
Figure 21
10
µ
100nF
F
2.7nF
V
REF
100nF
and
– 1.5 LSB
PDREF
REF
REFBUFIN
REFGND
IN
INGND
AVDD
V
Table 7
REF
– 1 LSB
02966-0-003
PD
Figure 22. Typical Connection Diagram
20
1
GND
Ω
.
PDBUF
+
Rev. A | Page 16 of 28
10
µ
AD7653
F
RESET
DGND
100nF
DVDD
Table 7. Output Codes and Ideal Input Voltages
Description
FSR – 1 LSB
FSR – 2 LSB
Midscale + 1 LSB
Midscale
Midscale – 1 LSB
–FSR + 1 LSB
–FSR
1
2
This is also the code for overrange analog input (V
This is also the code for underrange analog input (V
CS
V
REF
– V
OVDD
REFGND
RD
BYTESWAP
).
SER/PAR
IMPULSE
CNVST
OGND
SDOUT
OB/2C
WARP
BUSY
SCLK
100nF
Analog
Input
2.499962 V
2.499923 V
1.250038 V
1.25 V
1.249962 V
38 µV
0 V
+
D
DVDD
10
3
µ
SERIAL
F
PORT
CLOCK
Digital Output Code (Hex)
Straight
Binary
FFFF
FFFE
8001
8000
7FFF
0001
0000
DIGITAL SUPPLY
(3.3V OR 5V)
1
2
IN
µC/µP/DSP
IN
– V
below V
INGND
Twos
Complement
7FFF1
7FFE
0001
0000
FFFF
8001
8000
02966-A-004
above
INGND
2
).