AD7846 Analog Devices, AD7846 Datasheet - Page 12

• Manufacturer Part Number: AD7846
• Description: 16-Bit Voltage Output CMOS DAC
• Manufacturer: Analog Devices

Specifications of AD7846

• Resolution (bits): 16bit
• Dac Update Rate: 143kSPS
• Dac Settling Time: 7µs
• Max Pos Supply (v): +15.75V
• Single-supply: No
• Dac Type: Voltage Out
• Dac Input Format: Par

AD7846
OUTPUT STAGE
The output stage of the AD7846 is shown in Figure 22. It is capable
of driving a 2 kΩ/1000 pF load. It also has a resistor feedback
network that allows the user to configure it for gains of 1 or 2.
Table 6 shows the different output ranges that are possible.
An additional feature is that the output buffer is configured as a
track-and-hold amplifier. Although normally tracking its input,
this amplifier is placed in a hold mode for approximately 2.5 μs
after the leading edge of LDAC . This short state keeps the DAC
output at its previous voltage while the AD7846 is internally
changing to its new value. Thus, any glitches that occur in the
transition are not seen at the output. In systems where the
LDAC is tied permanently low, the deglitching is not in
V
V
REF+
REF–
DB15 TO DB12
DAC1
S15
S17
S1
S3
SEGMENT 16
SEGMENT 1
Figure 21. Digital-to-Analog Conversion
DB15 TO DB12
S14
S16
S2
S4
DAC2
Rev. G | Page 12 of 24
A1
A2
operation.
AD7846 without and with the deglitcher.
DAC3
Figure 13
DB11 TO DB0
12-BIT DAC
DAC3
R
IN
10kΩ
and
Figure 22. Output Stage
Figure 14
SHOT
LDAC
ONE
A3
10kΩ
R
R
show the outputs of the
V
R
C1
OUT
IN
V
OUT