EVAL-AD7677CBZ Analog Devices Inc, EVAL-AD7677CBZ Datasheet - Page 12

• Manufacturer Part Number: EVAL-AD7677CBZ
• Description: BOARD EVALUATION FOR AD7677
• Manufacturer: Analog Devices Inc
• Series: PulSAR®r

Specifications of EVAL-AD7677CBZ

• Number Of Adc's: 1
• Number Of Bits: 16
• Sampling Rate (per Second): 1M
• Data Interface: Serial, Parallel
• Inputs Per Adc: 1 Differential
• Input Range: ±VREF
• Power (typ) @ Conditions: 115mW @ 1MSPS
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: AD7677
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD7677
The Warp Mode allows the fastest conversion rate up to 1 MSPS.
However, in this mode, and this mode only, the full specified accu-
racy is guaranteed only when the time between conversion does
not exceed 1 ms. If the time between two consecutive conversions
is longer than 1 ms, for instance, after power-up, the first conver-
sion result should be ignored. This mode makes the AD7677
ideal for applications where fast sample rates are required.
The Normal Mode is the fastest mode (800 kSPS) without any
limitation about the time between conversions. This mode makes
the AD7677 ideal for asynchronous applications such as data
acquisition systems, where both high accuracy and fast sample
rate are required.
The Impulse Mode, the lowest power dissipation mode, allows
power saving between conversions. The maximum throughput
in this mode is 666 kSPS. When operating at 100 SPS, for
example, it typically consumes only 15 µW. This feature makes
the AD7677 ideal for battery-powered applications.
Transfer Functions
Using the OB/2C digital input, the AD7677 offers two output
codings: straight binary and two’s complement. The ideal trans-
fer characteristic for the AD7677 is shown in Figure 4.
ANALOG INPUT+
ANALOG INPUT–
ADR421
2.5V REF
NOTE 1
ANALOG
SUPPLY
NOTES
1. SEE VOLTAGE REFERENCE INPUT SECTION.
2. WITH THE RECOMMENDED VOLTAGE REFERENCES, C
3. OPTIONAL CIRCUITRY FOR HARDWARE GAIN CALIBRATION.
4. THE AD8021 IS RECOMMENDED. SEE DRIVER AMPLIFIER CHOICE SECTION.
5. SEE ANALOG INPUT SECTION.
6. OPTION, SEE POWER SUPPLY SECTION.
7. OPTIONAL LOW JITTER CNVST, SEE CONVERSION CONTROL SECTION.
NOTE 4
NOTE 4
100nF
(5V)
AD8021
1M
AD8021
NOTE 3
+
–
–
+
U1
U2
50
50
50k
C
C
C
C
+
15
15
+
NOTE 2
C
REF
10 F
NOTE 5
NOTE 5
2.7nF
2.7nF
1 F
100nF
Figure 5. Typical Connection Diagram
REF
REFGND
IN+
IN–
AVDD
NOTE 6
100
AGND
REF
IS 47 F. SEE CHAPTER VOLTAGE REFERENCE INPUT SECTION.
+
10 F
–12–
AD7677
DGND
TYPICAL CONNECTION DIAGRAM
Figure 5 shows a typical connection diagram for the AD7677.
Different circuitry shown on this diagram is optional and is
discussed below.
Analog Inputs
Figure 6 shows a simplified analog input section of AD7677.
100nF
DVDD
DVDD
111...111
111...110
111...101
000...010
000...001
000...000
Figure 4. ADC Ideal Transfer Function
OVDD
–FS + 0.5 LSB
–FS
BYTESWAP
SER/PAR
SDOUT
CNVST
OGND
RESET
OB/2C
SCLK
BUSY
–FS + 1 LSB
RD
CS
PD
100nF
ANALOG INPUT
+
NOTE 7
50
DVDD
10 F
SERIAL PORT
+FS – 1.5 LSB
DIGITAL SUPPLY
(3.3V OR 5V)
D
CLOCK
+FS – 1 LSB
C/ P/DSP
REV. A