AD7699BCPZ Analog Devices Inc, AD7699BCPZ Datasheet - Page 14

• Manufacturer Part Number: AD7699BCPZ
• Description: IC ADC 8CH 16BIT 500KSPS 20LFCSP
• Manufacturer: Analog Devices Inc

Specifications of AD7699BCPZ

• Data Interface: DSP, MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Bits: 16
• Sampling Rate (per Second): 500k
• Number Of Converters: 1
• Power Dissipation (max): 32mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-VFQFN, CSP Exposed Pad
• Resolution (bits): 16bit
• Sampling Rate: 500kSPS
• Input Channel Type: Pseudo Differential, Single Ended
• Supply Voltage Range - Analog: 4.5V To 5.5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD7699
TRANSFER FUNCTIONS
With the inputs configured for unipolar range (single ended,
COM with ground sense, or paired differentially with INx− as
ground sense), the data output is straight binary.
With the inputs configured for bipolar range (COM = V
paired differentially with INx− = V
twos complement.
The ideal transfer characteristic for the AD7699 is shown in
Figure 26 and for both unipolar and bipolar ranges with the
internal 4.096 V reference.
Table 6. Output Codes and Ideal Input Voltages
Description
FSR − 1 LSB
Midscale + 1 LSB
Midscale
Midscale − 1 LSB
−FSR + 1 LSB
−FSR
1
2
3
4
With COM or INx− = 0 V or all INx referenced to GND.
With COM or INx− = V
This is also the code for an overranged analog input ((INx+) − (INx−), or COM, above V
This is also the code for an underranged analog input ((INx+) − (INx−), or COM, below V
REF
/2.
4.095938 V
Unipolar Analog Input
V
2.048063 V
2.048 V
2.047938 V
62.5 μV
0 V
REF
= 4.096 V
REF
/2), the data outputs are
1
Digital Output Code
(Straight Binary Hex)
0xFFFF
0x8001
0x8000
0x7FFF
0x0001
0x0000
REF
3
3
/2 or
Rev. 0 | Page 14 of 28
REF
− V
GND
GND
).
COMPLEMENT
).
TWOS
011...111
011...110
011...101
100...010
100...001
100...000
Bipolar Analog Input
V
2.047938 V
62.5 μV
0 V
−62.5 μV
−2.047938 V
−2.048 V
REF
= 4.096 V
STRAIGHT
111...111
111...110
111...101
000...010
000...001
000...000
BINARY
Figure 26. ADC Ideal Transfer Function
–FSR + 0.5LSB
–FSR
–FSR + 1LSB
2
ANALOG INPUT
Digital Output Code
(Twos Complement Hex)
0x7FFF
0x0001
0x0000
0xFFFF
0x8001
0x8000
+FSR – 1.5LSB
3
4
+FSR – 1LSB