AD7676 Analog Devices, AD7676 Datasheet - Page 10

• Manufacturer Part Number: AD7676
• Manufacturer: Analog Devices

Specifications of AD7676

• Resolution (bits): 16bit
• # Chan: 1
• Sample Rate: 500kSPS
• Interface: Par,Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (2Vref) p-p
• Adc Architecture: SAR
• Pkg Type: CSP,QFP

AD7676
CIRCUIT INFORMATION
The AD7676 is a fast, low power, single-supply, precise 16-bit
analog-to-digital converter (ADC). The AD7676 is capable of
converting 500,000 samples per second (500 kSPS) and allows
power saving between conversions. When operating at 100 SPS,
for example, it typically consumes only 15 µW. This feature
makes the AD7676 ideal for battery-powered applications.
The AD7676 provides the user with an on-chip track-and-hold,
successive-approximation ADC that does not exhibit any pipeline
or latency, making it ideal for multiple multiplexed channel
applications.
The AD7676 can be operated from a single 5 V supply and be
interfaced to either 5 V or 3 V digital logic. It is housed in a
48-lead LQFP package or a 48-lead LFCSP package that combines
space savings and allows flexible configurations as either serial
or parallel interface. The AD7676 is pin-to-pin compatible with
the AD7675.
CONVERTER OPERATION
The AD7676 is a successive-approximation analog-to-digital
converter based on a charge redistribution DAC. Figure 3 shows
the simplified schematic of the ADC. The capacitive DAC consists
of two identical arrays of 16 binary weighted capacitors.
–5
–1
–2
–3
–4
4
2
0
5
3
1
–55
REFGND
–35
TPC 13. Drift vs. Temperature
REF
IN+
IN–
–15
–5
+FS
–FS
OFFSET
TEMPERATURE – C
15
35
55
75
32,768C 16,384C
32,768C 16,384C
Figure 3. ADC Simplified Schematic
95
MSB
115
MSB
135
4C
4C
–10–
2C
2C
During the acquisition phase, terminals of the array tied to the
comparator’s input are connected to AGND via SW
All independent switches are connected to the analog inputs.
Thus, the capacitor arrays are used as sampling capacitors and
acquire both analog signals.
When the acquisition phase is complete and the CNVST input
goes or is low, a conversion phase is initiated. When the conversion
phase begins, SW
arrays are then disconnected from the inputs and connected to
the REFGND input. Therefore, the differential voltage between
the output of IN+ and IN– captured at the end of the acquisition
phase is applied to the comparator inputs, causing the comparator
to become unbalanced.
By switching each element of the capacitor array between
REFGND or REF, the comparator input varies by binary
weighted voltage steps (V
control logic toggles these switches, starting with the MSB first,
in order to bring the comparator back into a balanced condition.
After the completion of this process, the control logic generates
the ADC output code and brings BUSY output LOW.
Transfer Functions
Using the OB/2C digital input, the AD7676 offers two output
codings: straight binary and twos complement. The ideal transfer
characteristic for the AD7676 is shown in Figure 4.
C
C
111...111
111...110
111...101
000...010
000...001
000...000
Figure 4. ADC Ideal Transfer Function
C
C
–FS
–FS + 0.5 LSB
LSB
LSB SW
+
and SW
–FS + 1 LSB
SW
COMP
+
–
REF
–
ANALOG INPUT
are opened first. The two capacitor
/2, V
SWITCHES
CONTROL
CONTROL
REF
CNVST
LOGIC
/4 . . . V
+FS – 1.5 LSB
OUTPUT
BUSY
CODE
REF
+FS – 1 LSB
/65536). The
+
and SW
REV. B
–
.