AD7699BCPZ Analog Devices Inc, AD7699BCPZ Datasheet - Page 21

• 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

The register can be written to during conversion, during acquisi-
tion, or spanning acquisition/conversion and is updated at the
end of conversion, t
delay when writing the CFG register. Note that at power-up, the
CFG register is undefined and two dummy conversions are
required to update the register. To preload the CFG register
with a factory setting, hold DIN high for two conversions. Thus
CFG[13:0] = 0x3FFF. This sets the AD7699 for the following:
13
CFG
Table 8. Configuration Register Description
Bit(s)
[13]
[12:10]
[9:7]
[6]
[5:3]
[2:1]
0
1
X = don’t care.
Name
CFG
INCC
INx
BW
REF
SEQ
RB
12
INCC
Description
Configuration update.
0 = Keep current configuration settings.
1 = Overwrite contents of register.
Input channel configuration. Selection of pseudobipolar, pseudodifferential, pairs, single-ended, or temperature sensor. Refer to
the
Bit 12
0
0
0
1
1
1
Input channel selection in binary fashion.
Bit 9
0
0
…
1
Select bandwidth for low-pass filter. Refer to the
0 = ¼ of BW, uses an additional series resistor to further bandwidth limit the noise. Maximum throughput must also be reduced to ¼.
1 = Full BW.
Reference/buffer selection. Selection of internal, external, and external buffered references, and enabling of the on-chip
temperature sensor. Refer to the
Bit 5
0
0
0
0
1
1
Channel sequencer. Allows for scanning channels in an IN0 to IN[7:0] fashion. Refer to the Sequencer section.
Bit 2
0
0
1
1
Read back the CFG register.
0 = Read back current configuration at end of data.
1 = Do not read back contents of configuration.
CONV
Input Configurations
11
INCC
(maximum). There is always a one deep
Bit 11
0
1
1
0
1
1
Bit 8
0
0
…
1
Bit 4
0
0
1
1
1
1
Bit 1
0
1
0
1
10
INCC
section.
9
INx
Voltage Reference Output/Input
Bit 10
X
0
1
X
0
1
Bit 7
0
1
…
1
Bit 3
0
1
0
1
0
1
1
1
8
INx
Rev. 0 | Page 21 of 28
Function
Bipolar differential pairs; INx− referenced to V
Bipolar; INx referenced to COM = V
Temperature sensor.
Unipolar differential pairs; INx− referenced to GND ± 0.1 V.
Unipolar, IN0 to IN7 referenced to COM = GND ± 0.1 V (GND sense).
Unipolar, IN0 to IN7 referenced to GND.
Channel
IN0
IN1
…
IN7
Function
Not used
Internal reference, REF = 4.096 V output.
External reference, temperature enabled.
External reference, internal buffer, temperature enabled.
External reference, temperature disabled.
External reference, internal buffer, temperature disabled.
Function
Disable sequencer.
Update configuration during sequence.
Scan IN0 to IN[7:0] (set in CFG[9:7]), then temperature.
Scan IN0 to IN[7:0] (set in CFG[9:7]).
Selectable Low-Pass Filter
7
INx
•
•
•
•
•
Table 8 summarizes the configuration register bit details. See
the Theory of Operation section for more details.
6
BW
IN[7:0] unipolar referenced to GND, sequenced in order
Full bandwidth for a one-pole filter
Internal reference/temperature sensor disabled, buffer
enabled
Enables the sequencer
No readback of the CFG register
section.
5
REF
section.
4
REF
REF
/2 ± 0.1 V.
3
REF
REF
/2 ± 0.1 V.
2
SEQ
1
SEQ
AD7699
0
RB