AD7610BCPZ1 AD [Analog Devices], AD7610BCPZ1 Datasheet - Page 17

• Manufacturer Part Number: AD7610BCPZ1
• Description: 16-Bit, 250 kSPS, Unipolar/Bipolar Programmable Input PulSAR ADC
• Manufacturer: AD [Analog Devices]

TRANSFER FUNCTIONS
Using the OB/ 2C digital input or via the configuration register,
the AD7610 offers two output codings: straight binary and twos
complement. See Figure 26 and Table 7 for the ideal transfer char-
acteristic and digital output codes for the different analog input
ranges, V
OB/ 2C input is a don’t care and should be tied to either high or low.
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 overrange analog input (V
IN
. Note that when using the configuration register, the
V
4.999924 V
4.999847 V
2.500076 V
2.5 V
2.499924 V
76.3 μV
0 V
IN
= 5 V
V
9.999847 V
9.999695 V
5.000153 V
5.000000 V
4.999847 V
152.6 μV
0 V
IN
IN+
IN+
= 10 V
− V
− V
IN−
IN−
above V
below V
V
REF
= 5 V
REF
REF
V
+4.999847 V
+4.999695 V
+152.6 μV
0 V
−152.6 μV
−4.999847 V
−5 V
IN
− V
− V
= ±5 V
Rev. 0 | Page 17 of 32
REFGND
REFGND
).
).
V
+9.999695 V
+9.999390 V
+305.2 μV
0 V
−305.2 μV
−9.999695 V
−10 V
IN
= ±10 V
111...111
111...110
111...101
000...010
000...001
000...000
–FSR + 0.5 LSB
–FSR
Figure 26. ADC Ideal Transfer Function
Straight Binary
0xFFFF
0xFFFE
0x8001
0x8000
0x7FFF
0x0001
0x0000
–FSR + 1 LSB
1
2
ANALOG INPUT
Digital Output Code
+FSR – 1.5 LSB
Twos Complement
0x7FFF
0x7FFE
0x0001
0x0000
0xFFFF
0x8001
0x8000
1
2
+FSR – 1 LSB
AD7610