AD7805 データシートの表示（PDF） - Analog Devices
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AD7805 Datasheet PDF : 28 Pages
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AD7804/AD7805/AD7808/AD7809
AD7804/AD7808 PIN FUNCTION DESCRIPTION
AD7804
Pin No.
1
2, 3
4
5
6
7
8
9
10
11
12
13
14, 15
16
AD7808
Pin No.
1, 6
2, 3
4
5
Mnemonic
AGND
VOUTB, VOUTA
REFOUT
PD
7, 8
VOUTF, VOUTE
9
FSIN
10
LDAC
11
SDIN
12
DGND
13
DVDD
14
CLKIN
15
CLR
16
17, 18
20
NC
VOUTH, VOUTG
REFIN
21
COMP
22, 23
19, 24
VOUTD, VOUTC
AVDD
Description
Ground reference point for analog circuitry.
Analog output voltage from the DACs.
Reference Output. This is a bandgap reference and is typically 1.23 V.
Active low input used to put the part into low power mode reducing current consumption
to 1 µA.
Analog output voltages from the DACs.
Level-triggered control input (active low). This is the frame synchronization signal for the
input data. When FSIN goes low, it enables the input shift register and data is transferred
on the falling edges of CLKIN.
LDAC Input. When this digital input is taken low, all DAC registers are simultaneously
updated with the contents of the data registers. If LDAC is tied permanently low, or is
low on the sixteenth falling clock edge with timing similar to that of SDIN, an automatic
update will take place.
Serial Data Input. These devices accept a 16-bit word. Data is clocked into the input shift
register on the falling edge of CLKIN.
Ground reference point for digital circuitry.
Digital Power Supply.
Clock Input. Data is clocked into the input shift register on the falling edges of CLKIN.
Duty Cycle should be between 40% and 60%.
Asynchronous CLR Input. When this input is taken low, all Main DAC outputs are
cleared either to VBIAS or to VBIAS/16 volts. All Sub DACs are also cleared and thus the
transfer function of the Main DAC will remain centered around the VBIAS point.
No Connect. This pin should be left open circuit.
Analog output voltages from the DACs.
This is an external reference input for the DACs. When this reference is selected for a
DAC in the control register, the analog output from the selected DAC swings around this
point.
Compensation Pin. This pin provides an output from the internal VDD/2 divider and is
provided for ac bypass purposes only. This pin should be decoupled with 1 nF capacitors
to both AVDD and AGND. This pin can be overdriven with an external reference, thus
giving the facility for two external references on the part.
Analog output voltage from the DACs.
Analog Power Supply. +3.3 V to +5 V.
AD7804 PIN CONFIGURATION
AD7808 PIN CONFIGURATION
AGND 1
16 AVDD
VOUTB 2
15 VOUTC
VOUTA 3
14 VOUTD
REFOUT 4 AD7804 13 COMP
TOP VIEW
FSIN 5 (Not to Scale) 12 REFIN
LDAC 6
11 CLR
SDIN 7
10 CLKIN
DGND 8
9 DVDD
AGND 1
VOUTB 2
VOUTA 3
REFOUT 4
24 AVDD
23 VOUTC
22 VOUTD
21 COMP
PD
AGND
VOUT F
VOUT E
FSIN
5 AD7808 20 REFIN
6 TOP VIEW 19 AVDD
7 (Not to Scale) 18 VOUTG
8
17 VOUTH
9
16 NC
LDAC 10
15 CLR
SDIN 11
14 CLKIN
DGND 12
13 DVDD
NC = NO CONNECT
REV. A
–7–
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