2 LC MOS a Complete, 8-Bit Analog I/0 Systems AD7569/AD7669 AD7569 FUNCTIONAL BLOCK DIAGRAM FEATURES 2 ms ADC with Track/Hold 1 ms DAC with Output Amplifier AD7569, Single DAC Output AD7669, Dual DAC Output On-Chip Bandgap Reference Fast Bus Interface Single or Dual 5 V Supplies GENERAL DESCRIPTION The AD7569/AD7669 is a complete, 8-bit, analog I/O system on a single monolithic chip. The AD7569 contains a high speed successive approximation ADC with 2 s conversion time, a track/ AD7669 FUNCTIONAL BLOCK DIAGRAM hold with 200 kHz bandwidth, a DAC and an output buffer ampli- fier with 1 s settling time. A temperature-compensated 1.25 V bandgap reference provides a precision reference voltage for the ADC and the DAC. The AD7669 is similar, but contains two DACs with output buffer amplifiers. A choice of analog input/output ranges is available. Using a sup- ply voltage of +5 V, input and output ranges of zero to 1.25 V and zero to 2.5 volts may be programmed using the RANGE in- put pin. Using a 5 V supply, bipolar ranges of 1.25 V or 2.5 V may be programmed. Digital interfacing is via an 8-bit I/O port and standard micro- processor control lines. Bus interface timing is extremely fast, al- lowing easy connection to all popular 8-bit microprocessors. A separate start convert line controls the track/hold and ADC to give precise control of the sampling period. PRODUCT HIGHLIGHTS The AD7569/AD7669 is fabricated in Linear-Compatible 1. Complete Analog I/O on a Single Chip. 2 CMOS (LC MOS), an advanced, mixed technology process The AD7569/AD7669 provides everything necessary to combining precision bipolar circuits with low power CMOS interface a microprocessor to the analog world. No external logic. The AD7569 is packaged in a 24-pin, 0.3 wide skinny components or user trims are required and the overall accu- DIP, a 24-terminal SOIC and 28-terminal PLCC and LCCC racy of the system is tightly specified, eliminating the need packages. The AD7669 is available in a 28-pin, 0.6 plastic to calculate error budgets from individual component DIP, 28-terminal SOIC and 28-terminal PLCC package. specifications. 2. Dynamic Specifications for DSP Users. In addition to the traditional ADC and DAC specifications, the AD7569/AD7669 is specified for ac parameters, includ- ing signal-to-noise ratio, distortion and input bandwidth. 3. Fast Microprocessor Interface. The AD7569/AD7669 has bus interface timing compatible with all modern microprocessors, with bus access and relin- quish times less than 75 ns and write pulse width less than 80 ns. REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. use, nor for any infringements of patents or other rights of third parties Tel: 617/329-4700 World Wide Web Site: AD7569/AD7669SPECIFICATIONS 2 (V = +5 V 6 5% V = RANGE = AGND = AGND = DGND = 0 V R = 2 kV, C = 100 pF to AGND DD SS DAC ADC L L DAC 1 DAC SPECIFICATIONS unless otherwise noted. All specifications T to T unless otherwise noted.) MIN MAX AD7569 3 J, A Versions AD7569 AD7669 K, B AD7569 AD7569 Parameter J Version Versions S Version T Version Units Conditions/Comments STATIC PERFORMANCE 4 Resolution 8 8 8 8 Bits 5 Total Unadjusted Error 2 2 3 3 LSB typ 5 Relative Accuracy 1 1/2 1 1/2 LSB max 5 Differential Nonlinearity 1 3/4 1 3/4 LSB max Guaranteed Monotonic Unipolar Offset Error DAC data is all 0s V = 0 V SS +25C 2 1.5 2 1.5 LSB max Typical tempco is 10 V/C for +1.25 V range T to T 2.5 2 2.5 2 LSB max MIN MAX Bipolar Zero Offset Error DAC data is all 0s V = 5 V SS +25C 2 1 5 2 1.5 LSB max Typical tempco is 20 V/C for 1.25 V range T to T 2.5 2 2.5 2 LSB max MIN MAX 6 Full-Scale Error (AD7569 Only) V = 5 V DD +25C 2 1 2 1 LSB max T to T 3 2 4 3 LSB max MIN MAX 6 Full-Scale Error (AD7669 Only) V = 5 V DD +25C 3 LSB max T to T 4.5 LSB max MIN MAX 6 DACA/DACB Full-Scale Error Match (AD7669 Only) 2.5 LSB max V = 5 V DD Full Scale/V , T = +25C 0.5 0.5 0.5 0.5 LSB max V = 2.5 V V = 5% DD A OUT DD Full Scale/V , T = +25C 0.5 0.5 0.5 0.5 LSB max V = 2.5 V V = 5% SS A OUT SS Load Regulation at Full Scale 0.2 0.2 0.2 0.2 LSB max R = 2 k to /C L DYNAMIC PERFORMANCE 5 Signal-to-Noise Ratio (SNR) 44 46 44 46 dB min V = 20 kHz full-scale sine wave with f = 400 kHz OUT SAMPLING 5 Total Harmonic Distortion (THD) 48 48 48 48 dB max V = 20 kHz full-scale sine wave with f = 400 kHz OUT SAMPLING 5 Intermodulation Distortion (IMD) 55 55 55 55 dB typ fa = 18.4 kHz, fb = 14.5 kHz with f = 400 kHz SAMPLING ANALOG OUTPUT Output Voltage Ranges Unipolar 0 to +1.25/2.5 Volts V = +5 V, V = 0 V DD SS Bipolar 1.25/2.5 Volts V = +5 V, V = 5 V DD SS LOGIC INPUTS CS, X/B,WR, RANGE, RESET, DB0DB7 Input Low Voltage, V 0.8 0.8 0.8 0.8 V max INL Input High Voltage, V 2.4 2.4 2.4 2.4 V min INH Input Leakage Current 10 10 10 10 A max V = 0 to V IN DD 7 Input Capacitance 10 10 10 10 pF max DB0DB7 Input Coding (Single Supply) Binary Input Coding (Dual Supply) 2s Complement 7 AC CHARACTERlSTICS Voltage Output Settling Time Settling time to within 1/2 LSB of final value Positive Full-Scale Change 2 2 2 2 s max Typically 1 s Negative Full-Scale Change (Single Supply) 4 4 4 4 s max Typically 2 s Negative Full-Scale Change (Dual Supply) 2 2 2 2 s max Typically 1 s 5 Digital-to-Analog Glitch Impulse 15 15 15 15 nV secs typ 5 Digital Feedthrough 1 1 1 1 nV secs typ V to V Isolation 60 60 60 60 dB typ V = 2.5 V, 50 kHz Sine Wave IN OUT IN 5 DAC to DAC Crosstalk (AD7669 Only) 1 nV secs typ 5 DACA to DACB Isolation (AD7669 Only) 70 dB max POWER REQUIREMENTS V Range 4.75/5.25 4.75/5.25 4.75/5.25 4.75/5.25 V min/V max For Specified Performance DD V Range (Dual Supplies) 4.75/5.25 4.75/5.25 4.75/5.25 4.75/5.25 V min/V max Specified Performance also applies to V = 0 V SS SS for unipolar ranges. I V = V = 2.5 V Logic Inputs = 2.4 V CLK = 0.8 V DD OUT IN (AD7569) 13 13 13 13 mA max Output unloaded (AD7669) 18 mA max Outputs unloaded I (Dual Supplies) V = V = 2.5 V Logic Inputs = 2.4 V CLK = 0.8 V SS OUT IN (AD7569) 4 4 4 4 mA max Output unloaded (AD7669) 6 mA max Outputs unloaded DAC/ADC MATCHING 6 Gain Matching V to V match with V = 2.5 V, IN OUT IN +25C 1 111% typ 20 kHz sine wave T to T 1 111% typ MIN MAX NOTES 1 Specifications apply to both DACs in the AD7669. V applies to both V A and V B of the AD7669. OUT OUT OUT 2 Except where noted, specifications apply for all output ranges including bipolar ranges with dual supply operation. 3 Temperature ranges as follows: J, K versions 0C to +70C A, B versions 40C to +85C S, T versions 55C to +125C 4 1 LSB = 4.88 mV for 0 V to +1.25 V output range, 9.76 mV for 0 V to +2.5 V and 1.25 V ranges and 19.5 mV for 2.5 V range. 5 See Terminology. 6 Includes internal voltage reference error and is calculated after offset error has been adjusted out. Ideal unipolar full-scale voltage is (FS 1 LSB) ideal bipolar positive full-scale voltage is (FS/2 1 LSB) and ideal bipolar negative full-scale voltage is FS/2. 7 Sample tested at +25C to ensure compliance. Specifications subject to change without notice. 2 REV. B