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EVAL-CONTROLBRD33 Datasheet(Fiches technique) 16 Page - Analog Devices

Numéro de pièce EVAL-CONTROLBRD33
Description  16-Bit, 2 LSB INL, 3 MSPS PulSAR® ADC
Télécharger  32 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
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AD7621
Rev. 0 | Page 16 of 32
TRANSFER FUNCTIONS
Using the OB/2C digital input, the AD7621 offers two output
codings: straight binary and twos complement. The LSB size
with VREF = 2.048 V is 2 × VREF/65536, which is 62.5 μV. Refer to
Figure 22 and Table 7 for the ideal transfer characteristic.
000...000
000...001
000...010
111...101
111...110
111...111
ANALOG INPUT
+FSR–1.5 LSB
+FSR–1 LSB
–FSR+1 LSB
–FSR
–FSR+0.5 LSB
Figure 22. ADC Ideal Transfer Function
Table 7. Output Codes and Ideal Input Voltages
Digital Output Code
Description
Analog Input
VREF = 2.048 V
Straight
Binary
Twos
Complement
FSR −1 LSB
+2.047938 V
0xFFFF1
0x7FFF1
FSR − 2 LSB
+2.047875 V
0xFFFE
0x7FFE
Midscale + 1 LSB
+62.5 μV
0x8001
0x0001
Midscale
0 V
0x8000
0x0000
Midscale − 1 LSB
−62.5 μV
0x7FFF
0xFFFF
−FSR + 1 LSB
−2.047938 V
0x0001
0x8001
−FSR
−2.048 V
0x00002
0x80002
1 This is also the code for overrange analog input (VIN+ − VIN− above
VREF − VREFGND).
2 This is also the code for underrange analog input (VIN+ − VIN− below
−VREF + VREFGND).
RD
CS
100nF
100nF
AVDD
10
μF
100nF
AGND
DGND
DVDD
OVDD
OGND
CNVST
BUSY
SDOUT
SCLK
RESET
PD
REFBUFIN
10
Ω
D
CLOCK
AD7621
MICROCONVERTER/
MICROPROCESSOR/
DSP
SERIAL
PORT
DIGITAL
INTERFACE
SUPPLY
(2.5V OR 3.3V)
ANALOG
SUPPLY (2.5V)
OVDD
WARP
DIGITAL
SUPPLY (2.5V)
IN+
IN–
U2
10
Ω
NOTE 5
50
Ω
50pF
NOTE 1
ANALOG
INPUT +
CC
CC
1nF
1nF
U1
10
Ω
NOTE 1
SER/PAR
OB/2C
REFGND
REF
PDBUF
PDREF
100nF
ANALOG
INPUT –
NOTE 2
NOTE 2
NOTE 3
NOTE 4
NOTE 3
NOTE 7
NOTE 6
IMPULSE
10
μF
10
μF
CREF
10
μF
10k
Ω
50pF
1. SEE ANALOG INPUT SECTION.
2. THE AD8021 IS RECOMMENDED. SEE DRIVER AMPLIFIER CHOICE SECTION.
3. THE CONFIGURATION SHOWN IS USING THE INTERNAL REFERENCE. SEE VOLTAGE REFERENCE INPUT SECTION.
4. A 10
μF CERAMIC CAPACITOR (X5R, 1206 SIZE) IS RECOMMENDED (e.g., PANASONIC ECJ3YB0J106M).
SEE VOLTAGE REFERENCE INPUT SECTION.
5. OPTION, SEE POWER SUPPLY SECTION.
6. OPTION, SEE POWER UP SECTION.
7. OPTIONAL LOW JITTER CNVST, SEE CONVERSION CONTROL SECTION.
Figure 23. Typical Connection Diagram




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