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AD7812YR датащи(PDF) 1 Page - Analog Devices |
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AD7812YR датащи(HTML) 1 Page - Analog Devices |
1 / 19 page Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD7811/AD7812 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 2.7 V to 5.5 V, 350 kSPS, 10-Bit 4-/8-Channel Sampling ADCs FEATURES 10-Bit ADC with 2.3 s Conversion Time The AD7811 has Four Single-Ended Inputs that Can Be Configured as Three Pseudo Differential Inputs with Respect to a Common, or as Two Inde- pendent Pseudo Differential Channels The AD7812 has Eight Single-Ended Inputs that Can Be Configured as Seven Pseudo Differential Inputs with Respect to a Common, or as Four Independent Pseudo Differential Channels Onboard Track and Hold Onboard Reference 2.5 V 2.5% Operating Supply Range: 2.7 V to 5.5 V Specifications at 2.7 V–3.6 V and 5 V 10% DSP-/Microcontroller-Compatible Serial Interface High Speed Sampling and Automatic Power-Down Modes Package Address Pin on the AD7811 and AD7812 Allows Sharing of the Serial Bus in Multipackage Applications Input Signal Range: 0 V to VREF Reference Input Range: 1.2 V to VDD GENERAL DESCRIPTION The AD7811 and AD7812 are high speed, low power, 10-bit A/D converters that operate from a single 2.7 V to 5.5 V supply. The devices contain a 2.3 µs successive approximation A/D converter, an on-chip track/hold amplifier, a 2.5 V on-chip refer- ence and a high speed serial interface that is compatible with the serial interfaces of most DSPs (Digital Signal Processors) and microcontrollers. The user also has the option of using an exter- nal reference by connecting it to the VREF pin and setting the EXTREF bit in the control register. The VREF pin may be tied to VDD. At slower throughput rates the power-down mode may be used to automatically power down between conversions. The control registers of the AD7811 and AD7812 allow the input channels to be configured as single-ended or pseudo differential. The control register also features a software convert start and a software power-down. Two of these devices can share the same serial bus and may be individually addressed in a multipackage application by hardwiring the device address pin. The AD7811 is available in a small, 16-lead 0.3" wide, plastic dual-in-line package (mini-DIP), in a 16-lead 0.15" wide, Small Outline IC (SOIC) and in a 16-lead, Thin Shrink Small Out- line Package (TSSOP). The AD7812 is available in a small, 20-lead 0.3" wide, plastic dual-in-line package (mini-DIP), in a 20-lead, Small Outline IC (SOIC) and in a 20-lead, Thin Shrink Small Outline Package (TSSOP). PRODUCT HIGHLIGHTS 1. Low Power, Single Supply Operation Both the AD7811 and AD7812 operate from a single 2.7 V to 5.5 V supply and typically consume only 10 mW of power. The power dissipation can be significantly reduced at lower throughput rates by using the automatic power- down mode e.g., 315 µW @ 10 kSPS, V DD = 3 V—see Power vs. Throughput. 2. 4-/8-Channel, 10-Bit ADC The AD7811 and AD7812 have four and eight single-ended input channels respectively. These inputs can be configured as pseudo differential inputs by using the Control Register. 3. On-chip 2.5 V ( ±2.5%) reference circuit that is powered down when using an external reference. 4. Hardware and Software Control The AD7811 and AD7812 provide for both hardware and software control of Convert Start and Power-Down. FUNCTIONAL BLOCK DIAGRAMS REV. B CHARGE REDISTRIBUTION DAC CLOCK OSC AD7811 CONVST AGND VDD/3 COMP REFIN VDD DOUT DGND A0 VIN1 VIN2 VIN3 VIN4 DIN RFS TFS SCLK BUF CONTROL LOGIC MUX CREF SERIAL PORT 1.23V REF CHARGE REDISTRIBUTION DAC CLOCK OSC AD7812 AGND REFIN VDD DOUT DGND A0 DIN RFS TFS SCLK BUF CONTROL LOGIC MUX CREF SERIAL PORT VIN1 VIN2 VIN3 VIN4 VIN5 VIN6 VIN7 VIN8 CONVST VDD/3 COMP 1.23V REF |
Аналогичный номер детали - AD7812YR |
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Аналогичное описание - AD7812YR |
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