1.75 MSPS, 4 mW a 10-Bit/12-Bit Parallel ADCs AD7470/AD7472 FUNCTIONAL BLOCK DIAGRAM FEATURES Specified for V of 2.7 V to 5.25 V DD AV DV V DD DD REF IN DRIVE 1.75 MSPS for AD7470 (10-Bit) 1.5 MSPS for AD7472 (12-Bit) Low Power 10-/12-BIT DB9 (DB11) AD7470: 3.34 mW Typ at 1.5 MSPS with 3 V Supplies SUCCESSIVE OUTPUT V T/H IN APPROXIMATION DRIVERS 7.97 mW Typ at 1.75 MSPS with 5 V Supplies ADC DB0 AD7472: 3.54 mW Typ at 1.2 MSPS with 3 V Supplies 8.7 mW Typ at 1.5 MSPS with 5 V Supplies Wide Input Bandwidth CLK IN 70 dB Typ SNR at 500 kHz Input Frequency CONTROL Flexible Power/Throughput Rate Management CONVST CS LOGIC No Pipeline Delays RD High Speed Parallel Interface BUSY Sleep Mode: 50 nA Typ AD7470/AD7472 24-Lead SOIC and TSSOP Packages AGND DGND GENERAL DESCRIPTION AD7470 IS A 10-BIT PART WITH DB0 TO DB9 AS OUTPUTS. The AD7470/AD7472 are 10-bit/12-bit high speed, low power, AD7472 IS A 12-BIT PART WITH DB0 TO DB11 AS OUTPUTS. successive approximation ADCs. The parts operate from a single 2.7 V to 5.25 V power supply and feature throughput rates up to 1.5 MSPS for the 12-bit AD7472 and up to 1.75 MSPS for the It is also possible to operate the parts in an auto sleep mode, 10-bit AD7470. The parts contain a low noise, wide bandwidth where the part wakes up to do a conversion and automatically track-and-hold amplifier that can handle input frequencies in enters sleep mode at the end of conversion. This method allows excess of 1 MHz. very low power dissipation numbers at lower throughput rates. In this mode, the AD7472 can be operated with 3 V supplies at The conversion process and data acquisition are controlled 100 kSPS, and consume an average current of just 124 A. At using standard control inputs, allowing easy interfacing to 5 V supplies and 100 kSPS, the average current consumption is microprocessors or DSPs. The input signal is sampled on the 171 A. falling edge of CONVST, and conversion is also initiated at this point. BUSY goes high at the start of conversion and The analog input range for the part is 0 V to REF IN. The 2.5 V goes low 531.66 ns after falling edge of CONVST (AD7472 reference is applied externally to the REF IN pin. The conver- with a clock frequency of 26 MHz) to indicate that the con- sion rate is determined by the externally-applied clock. version is complete. There are no pipeline delays associated with the parts. The conversion result is accessed via standard PRODUCT HIGHLIGHTS CS and RD signals over a high speed parallel interface. 1. High Throughput with Low Power Consumption. The AD7470 offers 1.75 MSPS throughput and the AD7472 The AD7470/AD7472 use advanced design techniques to offers 1.5 MSPS throughput rates with 4 mW power achieve very low power dissipation at high throughput rates. With consumption. 3 V supplies and 1.5 MSPS throughput rates, the AD7470 typically consumes, on average, just 1.1 mA. With 5 V supplies 2. Flexible Power/Throughput Rate Management. The conver- and 1.75 MSPS, the average current consumption is typically sion rate is determined by an externally-applied clock allow- 1.6 mA. The part also offers flexible power/throughput rate ing the power to be reduced as the conversion rate is reduced. management. Operating the AD7470 with 3 V supplies and The part also features an auto sleep mode to maximize power 500 kSPS throughput reduces the current consumption to 713 A. efficiency at lower throughput rates. At 5 V supplies and 500 kSPS, the part consumes 944 A. 3. No Pipeline Delay. The part features a standard successive approximation ADC with accurate control of the sampling instant via a CONVST input and once off conversion control. REV. B 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 that One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. may result from its use. No license is granted by implication or otherwise Tel: 781/329-4700 www.analog.com under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Fax: 781/326-8703 2003 Analog Devices, Inc. All rights reserved.AD7470/AD7472 2 (V = 2.7 V to 5.25 V , REF IN = 2.5 V, f = 30 MHz 5 V and 24 MHz 3 V DD CLKIN 1 3 AD7470SPECIFICATIONS T = T to T , unless otherwise noted.) A MIN MAX 1 Parameter A Version Unit Test Conditions/Comments DYNAMIC PERFORMANCE 5 V 3 V f = 1.75 MSPS 5 V, f = 1.5 MSPS 3 V S S Signal to Noise + Distortion (SINAD) 60 60 dB min f = 500 kHz Sine Wave IN 60 60 dB min f = 100 kHz Sine Wave IN Signal-to-Noise Ratio (SNR) 60 60 dB min f = 500 kHz Sine Wave IN 60 60 dB min f = 100 kHz Sine Wave IN Total Harmonic Distortion (THD) 83 83 dB typ f = 500 kHz Sine Wave IN 75 75 dB max f = 100 kHz Sine Wave IN Peak Harmonic or Spurious Noise (SFDR) 85 85 dB typ f = 500 kHz Sine Wave IN 75 75 dB max f = 100 kHz Sine Wave IN Intermodulation Distortion (IMD) Second-Order Terms 79 75 dB typ f = 500 kHz Sine Wave IN 75 75 dB max f = 100 kHz Sine Wave IN Third-Order Terms 77 75 dB typ f = 500 kHz Sine Wave IN 75 75 dB max f = 100 kHz Sine Wave IN Aperture Delay 5 5 ns typ Aperture Jitter 15 15 ps typ Full Power Bandwidth 20 20 MHz typ 3 dB DC ACCURACY f = 1.75 MSPS 5 V f = 1.5 MSPS 3 V S S Resolution 10 10 Bits Integral Nonlinearity 1 1 LSB max Differential Nonlinearity 0.9 0.9 LSB max Guaranteed No Missed Codes to 10 Bits Offset Error 2.5 2.5 LSB max Gain Error 1 1 LSB max ANALOG INPUT Input Voltage Ranges 0 to REF IN 0 to REF IN V DC Leakage Current 1 1 A max Input Capacitance 33 33 pF typ REFERENCE INPUT REF IN Input Voltage Range 2.5 2.5 V 1% for Specified Performance DC Leakage Current 1 1 A max Input Capacitance 10/20 10/20 pF typ Track-and-Hold Mode LOGIC INPUTS Input High Voltage, V 2.4 2.4 V min INH Input Low Voltage, V 0.4 0.4 V max INL Input Current, I 1 1 A max Typically 10 nA, V = 0 V or V IN IN DD 4 Input Capacitance, C 10 10 pF max IN LOGIC OUTPUTS Output High Voltage, V V 0.2 V 0.2 V min I = 200 A OH DRIVE DRIVE SOURCE Output Low Voltage, V 0.4 0.4 V max I = 200 A OL SINK Floating-State Leakage Current 10 10 A max V = 2.7 V to 5.25 V DD Floating-State Output Capacitance 10 10 pF max Output Coding Straight (Natural) Binary CONVERSION RATE Conversion Time 12 12 CLK IN Cycles (max) Track-and-Hold Acquisition Time 135 135 ns min Throughput Rate 1.75 1.5 MSPS max Conversion Time + Acquisition Time CLK IN of 30 MHz 5 V and 24 MHz 3 V POWER REQUIREMENTS V +2.7/+5.25 V min/max DD 5 I Digital Inputs = 0 V or DV DD DD Normal Mode 2.4 mA max V = 4.75 V to 5.25 V f = 1.75 MSPS Typ 2 mA DD S Quiescent Current 900 A max V = 4.75 V to 5.25 V f = 1.75 MSPS DD S Normal Mode 1.5 mA max V = 2.7 V to 3.3 V f = 1.5 MSPS Typ 1.3 mA DD S Quiescent Current 800 A max V = 2.7 V to 3.3 V f = 1.5 MSPS DD S Sleep Mode 1 A max CLK IN = 0 V or DV DD 5 Power Dissipation Digital Inputs = 0 V or DV DD Normal Mode 12 mW max V = 5 V DD 4.5 mW max V = 3 V DD Sleep Mode 5 W max V = 5 V CLK IN = 0 V or DV DD DD 3 W max V = 3 V CLK IN = 0 V or DV DD DD NOTES 1 Temperature ranges as follows: A Version: 40C to +85C. 2 The AD7470 functionally works at 2.35 V. Typical specifications 25C for SNR (100 kHz) = 59 dB THD (100 kHz) = 84 dB INL 0.8 LSB. 3 The AD7470 will typically maintain A-grade performance up to 125C, with a reduced CLK of 20 MHz 5 V and 16 MHz 3 V. Typical sleep mode current 125C is 700 nA. 4 Sample tested 25C to ensure compliance. 5 See Power vs. Throughput Rate section. Specifications subject to change without notice. REV. B 2