Datasheet AD4000, AD4004, AD4008 (Analog Devices) - 10

AD4000/ AD4004/ AD4008 Data Sheet PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS REF 1 10 VIO AD4000/ VDD 2 9 SDI AD4004/ IN+ 3 AD4008 8 SCK IN– 4 TOP VIEW 7 SDO REF 1 10 VIO (Not to Scale) VDD 2 AD4000/ 9 SDI GND 5 6 CNV IN+ AD4004 3 8 SCK NOTES IN– 4 TOP VIEW 7 SDO
003
(Not to Scale) 1. CONNECT THE EXPOSED PAD TO GND.
004
GND THIS CONNECTION IS NOT REQUIRED TO 5 6 CNV MEET THE SPECIFIED PERFORMANCE.
14956- 14956- Figure 3. 10-Lead MSOP Pin Configuration Figure 4. 10-Lead LFCSP Pin Configuration
Table 7. Pin Function Descriptions Pin No. Mnemonic Type1 Description
1 REF AI Reference Input Voltage. The VREF range is 2.4 V to 5.1 V. This pin is referred to the GND pin and must be decoupled closely to the GND pin with a 10 µF, X7R ceramic capacitor. 2 VDD P 1.8 V Power Supply. The VDD range is 1.71 V to 1.89 V. Bypass VDD to GND with a 0.1 μF ceramic capacitor. 3 IN+ AI Analog Input. This input is referred to analog ground sense pin (IN−). The device samples the voltage differential between IN+ and IN− on the leading edge on CNV. The operating input range of IN+ − IN− is 0 V to VREF. 4 IN− AI Analog Input Ground Sense. Connect this pin to the analog ground plane or to a remote sense ground. 5 GND P Power Supply Ground. 6 CNV DI Convert Input. This input has multiple functions. On its leading edge, it initiates the conversions and selects the interface mode of the device: daisy-chain mode or CS mode. In CS mode, the SDO pin is enabled when CNV is low. In daisy-chain mode, the data is read when CNV is high. 7 SDO DO Serial Data Output. The conversion result is output on this pin. It is synchronized to SCK. 8 SCK DI Serial Data Clock Input. When the device is selected, the conversion result is shifted out by this clock. 9 SDI DI Serial Data Input. This input provides multiple features. It selects the interface mode of the ADC as follows. Daisy-chain mode is selected if SDI is low during the CNV rising edge. In this mode, SDI is used as a data input to daisy-chain the conversion results of two or more ADCs onto a single SDO line. The digital data level on SDI is output on SDO with a delay of 16 SCK cycles. CS mode is selected if SDI is high during the CNV rising edge. In this mode, either SDI or CNV can enable the serial output signals when low. If SDI or CNV is low when the conversion is complete, the busy indicator feature is enabled. With CNV low, the device can be programmed by clocking in a 16-bit word on SDI on the rising edge of SCK. 10 VIO P Input/Output Interface Digital Power. Nominally, this pin is at the same supply as the host interface (1.8 V, 2.5 V, 3 V, or 5 V). Bypass VIO to GND with a 0.1 μF ceramic capacitor. N/A2 EPAD P Exposed Pad (LFCSP Only). Connect the exposed pad to GND. This connection is not required to meet the specified performance. 1 AI is analog input, P is power, DI is digital input, and DO is digital output. 2 N/A means not applicable. Rev. C | Page 10 of 36 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER OPERATION TRANSFER FUNCTIONS APPLICATIONS INFORMATION TYPICAL APPLICATION DIAGRAMS ANALOG INPUTS Input Overvoltage Clamp Circuit Switched Capacitor Input RC Filter Values DRIVER AMPLIFIER CHOICE High Frequency Input Signals Multiplexed Applications EASE OF DRIVE FEATURES Input Span Compression High-Z Mode Long Acquisition Phase VOLTAGE REFERENCE INPUT POWER SUPPLY DIGITAL INTERFACE REGISTER READ/WRITE FUNCTIONALITY STATUS WORD CSB MODE, 3-WIRE TURBO MODE CSB MODE, 3-WIRE WITHOUT BUSY INDICATOR CSB MODE, 3-WIRE WITH BUSY INDICATOR CSB MODE, 4-WIRE TURBO MODE CSB MODE, 4-WIRE WITHOUT BUSY INDICATOR CSB MODE, 4-WIRE WITH BUSY INDICATOR DAISY-CHAIN MODE LAYOUT GUIDELINES EVALUATING THE AD4000/AD4004/AD4008 PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE