AD7923BRUZ Analog Devices Inc, AD7923BRUZ Datasheet - Page 15

• Manufacturer Part Number: AD7923BRUZ
• Description: IC ADC 12BIT 4CH W/SEQ 16TSSOP
• Manufacturer: Analog Devices Inc

Specifications of AD7923BRUZ

• Data Interface: DSP, MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Bits: 12
• Sampling Rate (per Second): 200k
• Number Of Converters: 1
• Power Dissipation (max): 7.5mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP (0.173", 4.40mm Width)
• Resolution (bits): 12bit
• Sampling Rate: 200kSPS
• Input Channel Type: Single Ended
• Supply Voltage Range - Analog: 2.7V To 5.25V
• Supply Current: 2.7mA
• Number Of Elements: 1
• Resolution: 12Bit
• Architecture: SAR
• Sample Rate: 200KSPS
• Input Polarity: Unipolar
• Input Type: Voltage
• Rated Input Volt: 2.5/5V
• Differential Input: No
• Power Supply Requirement: Analog and Digital
• Single Supply Voltage (typ): 3/5V
• Single Supply Voltage (min): 2.7V
• Single Supply Voltage (max): 5.25V
• Dual Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Power Dissipation: 7.5mW
• Differential Linearity Error: ±1.5LSB
• Integral Nonlinearity Error: ±1LSB
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Pin Count: 16
• Package Type: TSSOP
• Input Signal Type: Single-Ended
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-AD7923CBZ - BOARD EVAL FOR AD7923
• Lead Free Status / Rohs Status: Compliant

ADC TRANSFER FUNCTION
The output coding of the AD7923 is either straight binary or
twos complement, depending on the status of the LSB in the
control register. The designed code transitions occur at succes-
sive LSB values (for example, 1 LSB, 2 LSBs). The LSB size is
REF
for the AD7923 when straight binary coding is selected is
shown in Figure 16 and the ideal transfer characteristic for the
AD7923 when twos complement coding is selected is shown in
Figure 17.
IN
/4096 for the AD7923. The ideal transfer characteristic
111...111
111...110
111...000
011...111
000...010
000...001
000...000
Figure 16. Straight Binary Transfer Characteristic
•
•
•
•
•
NOTES
1. V
REF
0V
0V
IS EITHER REF
V
1LSB
ANALOG INPUT
IN
1LSB = V
OR 2 × REF
REF
V
IN
+V
/4096
REF
0.1μF
R3
R2
– 1LSB
R1 = R2 = R3 = R4
V
R4
R1
REF
Figure 18. Handling Bipolar Signals
Rev. B | Page 15 of 24
REF
V
V
IN
IN
0
3
AD7923
•
•
IN
AV
DD
Handling Bipolar Input Signals
Figure 18 shows how useful the combination of the 2 × REF
input range and the twos complement output coding scheme is
for handling bipolar input signals. If the bipolar input signal is
biased around REF
selected, then REF
negative full scale, and + REF
a dynamic range of 2 × REF
V
DOUT
DRIVE
COMPLEMENT
+REF
–REF
REF
Figure 17. Twos Complement Transfer Characteristic
TWOS
011...111
011...110
000...001
000...000
111...111
100...010
100...001
100...000
IN
IN
IN
•
•
•
•
(= 2 × REF
(= 0V)
IN
–V
IN
with REF
becomes the zero-code point, −REF
REF
and twos complement output coding is
DSP/μP
+ 1LSB
V
V
IN
DD
DD
)
IN
IN
± REF
V
IN
.
REF
ANALOG INPUT
becomes positive full scale with
IN
– 1LSB
011...111
000...000
100...000
1LSB = 2 × V
Input Range
+V
REF
– 1LSB
REF
/4096
AD7923
IN
is
IN