Datasheet AD7680 (Analog Devices)

3 mW, 100 kSPS, 16-Bit ADC in 6-Lead SOT-23 AD7680 FEATURES FUNCTIONAL BLOCK DIAGRAM Fast throughput rate: 100 kSPS VDD Specified for VDD of 2.5 V to 5.5 V Low power 16-BIT SUCCESSIVE 3 mW typ at 100 kSPS with 2.5 V supply VIN T/H APPROXIMATION ADC 3.9 mW typ at 100 kSPS with 3 V supply 16.7 mW typ at 100 kSPS with 5 V supply SCLK Wide input bandwidth AD7680 CONTROL SDATA 86 dB SNR at 10 kHz input frequency LOGIC CS Flexible power/serial clock speed management No pipeline delays GND
03643-0-001
High speed serial interface
Figure 1.
SPI®/QSPI™/μWire/DSP compatible Standby mode: 0.5 μA max 6-Lead SOT-23 and 8-Lead MSOP packages Table 1. MSOP/SOT-23 16-Bit PulSAR ADC APPLICATIONS Type/kSPS 100 kSPS 250 kSPS 500 kSPS Battery-powered systems:
True Differential AD7684 AD7687 AD7688
Personal digital assistants
Pseudo Differential AD7683 AD7685 AD7686
Medical instruments
Unipolar AD7680
Mobile communications Instrumentation and control systems Remote data acquisition systems High speed modems Optical sensors GENERAL DESCRIPTION PRODUCT HIGHLIGHTS
The AD7680 is a 16-bit, fast, low power, successive 1. First 16-bit ADC in a SOT-23 package. approximation ADC. The part operates from a single 2.5 V to 2. High throughput with low power consumption. 5.5 V power supply and features throughput rates up to 100 kSPS. The part contains a low noise, wide bandwidth track-and-hold 3. Flexible power/serial clock speed management. The amplifier that can handle input frequencies in excess of 7 MHz. conversion rate is determined by the serial clock, allowing the conversion time to be reduced through the serial clock The conversion process and data acquisition are controlled speed increase. This allows the average power consumption using CS and the serial clock, allowing the devices to interface to be reduced when a power-down mode is used while not with microprocessors or DSPs. The input signal is sampled on converting. The part also features a shutdown mode to the falling edge of CS and the conversion is also initiated at this maximize power efficiency at lower throughput rates. point. There are no pipeline delays associated with the part. Power consumption is 0.5 μA max when in shutdown. The AD7680 uses advanced design techniques to achieve very 4. Reference derived from the power supply. low power dissipation at fast throughput rates. The reference for 5. No pipeline delays. the part is taken internally from VDD, which allows the widest dynamic input range to the ADC. Thus, the analog input range This part features a standard successive approximation ADC for this part is 0 V to VDD. The conversion rate is determined by with accurate control of the sampling instant via a CS input and the SCLK frequency. once-off conversion control.
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Document Outline SPECIFICATIONS SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TERMINOLOGY TYPICAL PERFORMANCE CHARACTERISTICS CIRCUIT INFORMATION CONVERTER OPERATION ANALOG INPUT ADC TRANSFER FUNCTION TYPICAL CONNECTION DIAGRAM Digital Inputs MODES OF OPERATION NORMAL MODE POWER-DOWN MODE POWER VS. THROUGHPUT RATE SERIAL INTERFACE AD7680 TO ADSP-218x APPLICATION HINTS GROUNDING AND LAYOUT OUTLINE DIMENSIONS ORDERING GUIDE