Datenblatt-Suchmaschine für elektronische Bauteile |
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AD7804BN Datenblatt(PDF) 8 Page - Analog Devices |
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AD7804BN Datenblatt(HTML) 8 Page - Analog Devices |
8 / 28 page AD7804/AD7805/AD7808/AD7809 REV. A –8– AD7805/AD7809 PIN FUNCTION DESCRIPTIONS AD7805 AD7809 Pin No. Pin No. Mnemonic Description 1, 11, 13, NC No Connect. These pins should be left open circuit. 20, 33 1 2, 5, 39, 40 AGND Ground reference point for analog circuitry. 2, 3 41, 42 VOUTB, VOUTA Analog output voltages from the DACs. 4 43 REFOUT Reference Output. This is a bandgap reference and is typically 1.23 V. 5–10, 3, 4, 6, 7, 9, DB9–DB2 Data Inputs. DB9 to DB2 are the 8 MSBs of the data word. 12, 13 10, 15, 23 19, 20 24, 26 DB1, DB0 DB1 and DB0 function as the 2 LSBs of the 10-bit word in 10-bit parallel mode but have other functions when BYTE loading structure is used. 8, 12 VOUTF, VOUTE Analog output voltages from the DACs. 11 14 LDAC LDAC Input. When this digital input is taken low, all DAC registers are simultaneously updated with the contents of the DAC data registers. If LDAC is permanently tied low, or is low during the rising edge of WR similar to data inputs, an automatic update will take place. 14 16 DGND Ground reference point for digital circuitry. 15 17 DVDD Digital Power Supply. 16 18 WR Write Input WR is an active low logic input which is used in conjunction with CS and the address pins to write data to the relevant registers. 17 21 CS Chip Select. Active low logic input. 18 19 CLR 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. 22, 25 VOUTH, VOUTG Analog output voltages from the DACs. 21, 22 27, 29, 30 A2, A1, A0 DAC Address Inputs. These digital inputs are used in conjunction with CS and WR to determine which DAC channel control register or DAC data register is loaded from the input register. These address bits are don’t cares when writing to the system control register. 23 31 MODE Logic Input. Logic high enables writing to the DAC data registers, a logic low enables writing to the control registers. 24 32 REFIN This is an external reference input for the DAC. When this reference is selected for the DAC in the control register, the analog output from the selected DAC swings around this point. 25 34 COMP 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. 26, 27 35, 36 VOUTD, VOUTC Analog output voltages from the DACs. 28 28, 37, 38 AVDD Analog Power Supply. 44 PD Active low input used to put the part into low power mode reducing current consump- tion to 1 µA. AD7805 PIN CONFIGURATION TOP VIEW (Not to Scale) 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 AD7805 DGND DB2 DB3 LDAC DB4 DB5 DB6 AGND VOUTB VOUTA REFOUT DB7 DB8 DB9 DVDD WR CS CLR DB1 DB0 A1 AVDD VOUTC VOUTD COMP A0 MODE REFIN AD7809 PIN CONFIGURATION 44 43 42 41 40 39 38 37 36 35 34 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 33 32 31 30 29 28 27 26 25 24 23 PIN 1 IDENTIFIER TOP VIEW (Not to Scale) NC = NO CONNECT NC REFIN MODE A0 A1 AVDD A2 DB0 VOUTG DB1 DB2 NC AGND DB9 DB8 AGND DB7 DB6 VOUTF DB5 DB4 NC AD7809 |
Ähnliche Teilenummer - AD7804BN |
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Ähnliche Beschreibung - AD7804BN |
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