® ® ADSD-1402 Dual, 14-Bit, 2MSPS Sampling A/D Converter FEATURES • • • • • • • • • 14-bit resolution; 2MSPS sampling rate Functionally complete; ±5V input range No missing codes over full temperature range Edge-triggered; No pipeline delays ±5V supplies, 0.725 Watts Small, 40-pin, side-brazed, ceramic TDIP 79dB SNR, –80dB THD Ideal for both time and frequency domain applications Out-of-range indicator INPUT/OUTPUT CONNECTIONS GENERAL DESCRIPTION DATEL's ADSD-1402 is a functionally complete, dual 14-bit, 2MSPS, sampling A/D converter. Its standard, 40-pin, triplewide ceramic DIP contains two fast-settling sample/hold amplifiers, two 14-bit A/D converters, multiplexed output buffers, a precision reference, and all the timing and control logic necessary to operate from either two or a single start convert pulse. The ADSD-1402 is optimized for wideband frequencydomain applications and is fully FFT tested. The ADSD-1402 requires only ±5V supplies and typically consumes 0.725 Watts. Models are available in either commercial 0 to +70°C or military -55 to +125°C operating temperature ranges. O F F S E T A D J U S T A A N A L O G PIN FUNCTION 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 INPUT A +5VA ANALOG GROUND GAIN A OFFSET A RANGE 2.5V REF ANALOG GROUND –5V ENABLE A START A +5VD BIT 14 (LSB) BIT 13 BIT 12 BIT 11 BIT 10 BIT 9 BIT 8 DGND PIN FUNCTION 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 INPUT B +5VA ANALOG GROUND GAIN B OFFSET B N/C N/C ANALOG GROUND –5V ENABLE B START B EOC BIT 1 (MSB) BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 DGND 5 IN P U T A A D C 1 1 S /H 1 8 0 0 + 2 8 A M P O F F S E T A D J U S T B 3 6 A N A L O G IN P U T B 4 0 8 0 0 + A D C 2 S /H 2 A M P B U F F E R R E F B 1 (M S B ) 2 7 B 2 2 6 B 3 2 5 B 4 2 4 B 5 2 3 B 6 2 2 B 7 1 9 B 8 1 8 B 9 1 7 B 1 0 1 6 B 1 1 1 5 B 1 2 1 4 B 1 3 1 3 B 1 4 B U F F E R R A N G E 6 E N A B L E B 3 1 E N A B L E A 1 0 S T A R T C O N A 1 1 S T A R T C O N B 3 0 T IM IN G A N D C O N T R O L L O G IC E O C 2 9 1 2 + 5 V D 9 , 3 2 5 V 2 , 3 9 + 5 V A 3 , 8 , 3 3 , 3 8 , A G N D 2 0 , 2 1 D G N D 3 4 , 3 5 N /C Figure 1. ADSD-1402 Functional Block Diagram DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.) • Tel: (508) 339-3000 Fax: (508) 339-6356 • For immediate assistance: (800) 233-2765 ® ® ADSD-1402 ABSOLUTE MAXIMUM RATINGS PARAMETERS +5V Supply (Pins 2, 12, 39) –5V Supply (Pins 9, 32) Digital Inputs (Pins 3, 10, 11, 31) Analog Input (Pins 1, 40) Lead Temp. (10 seconds) LIMITS UNITS 0 to +6 0 to –6 –0.3 to +VDD +0.3 ±7 +300 Volts Volts Volts Volts °C DYNAMIC PERFORMANCE Total Harm. Distort. (–0.5dB) dc to 500kHz 500kHz to 1MHz Signal-to-Noise Ratio (w/o distortion, –0.5dB dc to 500kHz 500kHz to 1MHz Signal-to-Noise Ratio (and distortion, –0.5dB) dc to 500kHz 500kHz to 1MHz Spurious Free Dyn. Range ➀ dc to 500kHz 500kHz to 1MHz Two-tone IMD Distortion (fin = 975kHz, fs = 2.0Mhz, –0.5dB) Input Bandwidth (–3dB) Small Signal (–20dB input) Large Signal (–0.5dB input) Slew Rate Aperture Delay Time Aperature Uncertainty S/H Acq. Time, (to ±0.003%FSR) Step input Conversion Rate FUNCTIONAL SPECIFICATIONS (TA = +25°C, +VDD = +5V, Vee = –5V, 2MSPS sampling rate,Vin = ±5V and a minimum 7 minute warmup unless otherwise specified.) ANALOG INPUTS MIN. TYP. MAX. UNITS Input Voltage Range Input Impedence Input Capacitance — — — ±5V 800 7 — — 15 Volts Ω pF +2.0 — — — — — — — — +0.8 +5 –600 Volts Volts µA µA DIGITAL INPUTS Logic Levels Logic "1" Logic "0" Logic Loading "1" Logic Loading "0" PERFORMANCE Integral Non-Linearity +25°C(fin=10kHz) 0 to +70°C –55 to +125°C Differential Non-Linearity (fin = 10kHz) +25°C 0 to +70°C –55 to +125°C Offset Error +25°C (see Figure 3) 0 to +70°C –55 to +125°C Gain Error +25°C (see Figure 3) 0 to +70°C –55 to +125°C No Missing Codes (fin = 975kHz) 14 Bits Resolution — — — ±1 ±1 ±2 — — — Feedthrough Rejection (fin = 1MHz) Noise LSB LSB LSB –0.99 –0.99 –0.99 ±0.5 ±0.5 ±0.75 +1.75 +1.75 +1.75 LSB LSB LSB — — — ±0.25 ±0.25 ±0.5 ±0.5 ±0.5 ±0.8 %FSR %FSR %FSR — — — ±0.3 ±0.3 ±0.6 ±0.6 ±0.6 ±0.8 %FSR %FSR %FSR Power Supply Ranges –5V Supply +5V Supply Power Supply Currents –5V Supply +5V Supply Power Dissipation Power Supply Rejection Oper. Temp. Range, Ambient ADSD-1402MC ADSD-1402MM Storage Temperature Range Package Type Offset Bin. — — — — — +0.4 –160 +6.4 Volts Volts µA mA +2.45 +2.45 — +2.5 +2.5 — +2.55 +2.55 5 Volts Volts mA MAX. UNITS — — –79 –73 –72 –70 dB dB 75 75 79 78 — — dB dB 71 69 76 73 — — dB dB — — –85 –74 –70 –70 dB dB –76 — — dB — — — — — 16 12 ±250 — — — — — ±10 5 MHz MHz V/µs ns ps — 100 150 ns 2 — — MHz — — 85 250 — — dB µVrms –5.25 +4.75 –5 +5.0 –4.75 +5.25 Volts Volts –80 — — — –70 +50 0.6 — — +70 0.725 ±0.01 mA mA Watts %FSR%V PHYSICAL/ENVIRONMENTAL –55 to +125°C 14 Bits +2.4 — — — TYP. POWER REQUIREMENTS OUTPUTS Output Coding Logic Level Logic "1" Logic "0" Logic Loading "1" Logic Loading "0" Internal Reference Voltage, +25°C 0 to +70°C External Current MIN. Footnote: ➀ Same specification as In-Band Harmonics and Peak Harmonics. 2 0 — +70 –55 — +125 –65 — +150 40-pin, metal-sealed, ceramic °C °C °C TDIP ® ® ADSD-1402 TECHNICAL NOTES 3. Full-Scale (Gain) Adjustments 1. Rated performance requires using good high-frequency circuit board layout techniques. Connect the digital and analog grounds to one point, the analog ground plane beneath the converter. Due to the inductance and resistance of the power supply return paths, return the analog and digital ground separately to the power supplies. Set the output of the voltage reference used in step 2 to the value shown in Table 2. Table 2. Offset and Gain Adjustments Input Range CALIBRATION PROCEDURE 1. Connect the converter per Figure 3. Apply a pulse of 100 nanoseconds minimum to START CONVERT (pin 11) at a rate of 200kHz. This rate is chosen to reduce flicker if LED's are used on the outputs for calibration purposes. Offset Adjust +1/2 LSB ±5V 2. Zero (Offset) Adjustments +0.000305V 4. Repeat above steps for Analog Input B (Pin 40). Use trimpot R3 for the zero (Offset) adjustment and trimpot R4 for the Full-Scale (Gain) adjustment. 5. To confirm proper operation of the device, vary the precision reference voltage source to obtain the output coding listed in Table 3. 25 nSec. per division N N+1 START CONVERT 400 nSec. 100 nSec. 325 nSec. 175 nSec. DATA OUT DATA N VALID ENABLE A 75 nSec. ENABLE B 75 nSec. Data N B Data N A DATA A or B OUT HIGH Z HIGH Z HIGH Z Figure 2. ADSD-1402 Timing Diagram Table 3. Output Coding OUTPUT CODING MSB LSB 11 11 11 10 01 00 00 00 1111 1000 0000 0000 0000 1000 0000 0000 1111 1111 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0001 0000 0000 +4.999085V Adjust the gain trimpot R1 until the output code flickers equally between 11 1111 1111 1110 and 11 1111 1111 1111 Apply a precision voltage reference source between ANALOG INPUT A (pin 1) and SIGNAL GROUND (pin 3), then adjust the reference source output per Table 2. Adjust trimpot R2 until the code flickers equally between 10 0000 0000 0000 and 10 0000 0000 0001. EOC Gain Adjust FS – 1½ LSB INPUT RANGE ±5V BIPOLAR SCALE +4.999390 +4.250000 +2.500000 ±0.000000 –2.500000 –4.250000 –4.999390 –5.000000 +FS – 1LSB +3/4FS +1/2FS 0 –1/2FS –3/4FS –FS+1LSB –FS 3 ® ADSD-1402 5 V + 5 V .1 u F .1 u F 1 0 u F 1 0 u F In p u t A 2 , 1 2 , 3 9 9 , 3 2 7 2 .5 V R E F . 0 .1 µ F 6 R a n g e 1 0 u F R 1 R 2 R 3 R 4 + 5 V + In p u t B N /C 3 4 , 3 5 E O C 2 9 2 8 B IT 1 (M S B ) 2 7 B IT 2 2 6 B IT 3 1 In A 2 5 B IT 4 4 0 In B 2 4 2 3 B IT 5 B IT 6 2 2 B IT 7 1 9 B IT B IT B IT B IT B IT B IT B IT 3 , 8 , 2 0 , 2 1 , 3 3 , 3 8 G N D 4 1 0 K G a in A 1 8 5 O ffs e t A 1 0 K A D S D -1 4 0 2 3 6 O ffs e t B 1 0 K 1 7 1 6 1 5 1 4 3 7 G a in B 1 0 K 5 V 1 3 8 9 1 0 1 1 1 2 1 3 1 4 (L S B ) 1 1 S ta rt A 3 0 S ta rt B S W 2 E n a b le B E n a b le A + 5 V 3 1 1 0 S W 1 + 5 V See timing diagram for details. Notes: ➀ Recommended to use same supply source for +5 Analog and +5 Digital. Try using as clean of a supply as possible (Bypass caps., 10uF and .1uF). ➁ Outputs are enabled by either turning ENABLE A (Pin 10) or ENABLE B (Pin 31) low for prespective analog inputs A or B. A high on ENABLE A or ENABLE B results in disabling the output bus (High Z). Figure 3. ADSD-1402 Connection Diagram THERMAL REQUIREMENTS conduct heat away from the package. Electrically-insulating, thermally-conductive "pads" may be installed underneath the package. Devices should be soldered to boards rather than "socketed", and of course, minimal air flow over the surface can greatly help reduce the package temperature. The ADSD-1402 sampling A/D converter is fully characterized and specified over the commercial operating temperature (ambient) range of 0 to +70°C (MC suffix) and military temperature range of –55 to +125°C (MM suffix). All roomtemperature (TA = +25°C) production testing is performed without the use of heat sinks or forced-air cooling. Thermal impedance figures for each device are listed in their respective specification tables. In more severe ambient conditions, the package/junction temperature of a given device can be reduced dramatically (typically 35%) by using one of DATEL's HS Series heat sinks. See Ordering Information for the assigned part number. Request DATEL Application Note AN-8, "Heat Sinks for DIP Data Converters", or contact DATEL directly, for additional information. These devices do not normally require heat sinks, however, standard precautionary design and layout procedures should be used to ensure devices do not overheat. The ground and power planes beneath the package, as well as all pcb signal runs to and from the device, should be as heavy as possible to help 4 ® ® ® ADSD-1402 MECHANICAL DIMENSIONS INCHES (mm) 2.12/2.07 (53.85/52.58) 40 Dimension Tolerances (unless otherwise indicated): 2 place decimal (.XX) ±0.010 (±0.254) 3 place decimal (.XXX) ±0.005 (±0.127) 21 Lead Material: Kovar alloy 1.11/1.08 (28.20/27.43) 1 Lead Finish: 50 microinches (minimum) gold plating over 100 microinches (nominal) nickel plating 20 0.100 TYP. (2.540) 1.900 ±0.008 (48.260) 0.245 MAX. (6.223) PIN 1 INDEX ( ON TOP) 0.200/0.175 (5.080/4.445) 0.015/0.009 (0.381/0.229) 0.210 MAX. (5.334) 0.018 ±0.002 (0.457) 0.110/0.090 (2.794/2.286) 0.045/0.035 (1.143/0.889) 0.900 ±0.010 (22.86) 0.110/0.090 (2.794/2.286 SEATING PLANE 0.035/0.015 (0.889/0.381) ORDERING INFORMATION MODEL NUMBER OPERATING TEMP. RANGE ADSD-1402MC 0 to +70°C ADSD-1402MM –55 to +125°C ACCESSORIES HS-40 Heat Sink for all ADSD-1402 models Contact DATEL for high-reliability versions ® ® ISO 9001 DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 Tel: (508) 339-3000 / Fax: (508) 339-6356 For immediate assistance: (800) 233-2765 Internet: www.datel.com DS-0520C 11/03 DATEL (UK) LTD. Tadley, England Tel: (01256)-880444 DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 1-34-60-01-01 DATEL GmbH Munchen, Germany Tel: 89-544334-0 DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-6354-2025 DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. 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