AD7927BRUZ Analog Devices Inc, AD7927BRUZ Datasheet - Page 8

• Manufacturer Part Number: AD7927BRUZ
• Description: IC ADC 12BIT 8CH 200KSPS 20TSSOP
• Manufacturer: Analog Devices Inc

Specifications of AD7927BRUZ

• 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 ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-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: 1.5mA
• 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: -0.9LSB/1.5LSB
• Integral Nonlinearity Error: ±1LSB
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 20
• Package Type: TSSOP
• Input Signal Type: Single-Ended
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-AD7927CBZ - BOARD EVALUATION FOR AD7927
• Lead Free Status / Rohs Status: Compliant

AD7927–Typical Performance Characteristics
PERFORMANCE CURVES
TPC 1 shows a typical FFT plot for the AD7927 at 200 kSPS
sample rate and 50 kHz input frequency. TPC 2 shows the
signal-to-(noise + distortion) ratio performance versus input
frequency for various supply voltages while sampling at 200 kSPS
with an SCLK of 20 MHz.
TPC 3 shows the power supply rejection ratio versus supply
ripple frequency for the AD7927 with no decoupling. The power
supply rejection ratio is defined as the ratio of the power in the
ADC output at full-scale frequency f, to the power of a 200 mV
p-p sine wave applied to the ADC AV
Pf is equal to the power at frequency f in ADC output; Pf
to the power at frequency f
Here a 200 mV p-p sine wave is coupled onto the AV
TPC 2. SINAD vs. Analog Input Frequency for Various
Supply Voltages at 200 kSPS
–110
–10
–30
–50
–70
–90
75
70
65
60
TPC 1. Dynamic Performance at 200 kSPS
0
0
f
T
RANGE = 0 TO REF
SAMPLE
A
10
= 25 C
PSRR dB
20
= 200kSPS
30
(
INPUT FREQUENCY – kHz
S
IN
FREQUENCY – kHz
coupled onto the ADC AV
)
40
= 10
50
log(
60
DD
Pf Pf
AV
AV
AV
AV
4096 POINT FFT
AV
f
f
SINAD = 70.714dB
THD =
SFDR =
SAMPLE
IN
supply of frequency f
/
DD
DD
DD
DD
70
DD
= 50kHz
= V
= V
= V
= V
s
= 4.75V
)
DRIVE
DRIVE
DRIVE
DRIVE
= 200kSPS
82.853dB
80
84.815dB
= 5.25V
= 4.75V
= 3.6V
= 2.7V
90
DD
DD
100
S
100
supply.
is equal
supply.
S
:
–8–
TPC 4 shows a graph of total harmonic distortion versus analog
input frequency for various supply voltages, while TPC 5 shows
a graph of total harmonic distortion versus analog input frequency
for various source impedances. See the Analog Input section.
TPC 6 and TPC 7 show typical INL and DNL plots for the
AD7927.
TPC 4. THD vs. Analog Input Frequency for Various
Supply Voltages at 200 kSPS
TPC 5. THD vs. Analog Input Frequency for Various
Source Impedances
–10
–20
–30
–40
–50
–60
–70
–80
–90
–50
–55
–60
–65
–70
–75
–80
–85
–90
–55
–60
–65
–70
–75
–80
–85
–90
–95
TPC 3. PSRR vs. Supply Ripple Frequency
0
10
10
0
f
T
AV
RANGE = 0 TO REF
RANGE = 0 TO REF
AV
200mV p-p SINE WAVE ON AV
REF
T
f
T
SAMPLE
SAMPLE
A
A
A
DD
DD
= 25 C
= 25 C
= 25 C
20
IN
= 5.25V
= 5V
= 2.5V, 1 F CAPACITOR
= 200kSPS
= 200kSPS
40
SUPPLY RIPPLE FREQUENCY – kHz
60
INPUT FREQUENCY – kHz
INPUT FREQUENCY – kHz
IN
IN
R
IN
80
= 1000
AV
DD
R
IN
100
AV
DD
AV
= V
= 100
DD
R
DD
DRIVE
IN
120
= V
= V
= 50
DRIVE
AV
DRIVE
= 3.6V
DD
140
= V
= 4.75V
= 2.7V
R
IN
160
DRIVE
= 10
= 5.25V
180
200
100
100
REV. 0