AD8400 Analog Devices, AD8400 Datasheet
AD8400
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AD8400 Summary of contents
Page 1
... The digital interface is still active in shutdown so that code changes can be made that will produce new wiper positions when the device is taken out of shutdown. The AD8400 is available in both the SO-8 surface-mount and the 8-lead plastic DIP package. The AD8402 is available in both surface mount (SO-14) and ...
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... AD8400/AD8402/AD8403–SPECIFICATIONS ELECTRICAL CHARACTERISTICS–10 k VERSION Parameter DC CHARACTERISTICS RHEOSTAT MODE (Specifications Apply to All VRs) 2 Resistor Differential NL 2 Resistor Nonlinearity 3 Nominal Resistance Resistance Tempco Wiper Resistance Nominal Resistance Match DC CHARACTERISTICS POTENTIOMETER DIVIDER Specifications Apply to All VRs Resolution 4 Integral Nonlinearity 4 Differential Nonlinearity Voltage Divider Tempco ...
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... _50K R NWB kΩ kHz _100K R NWB AD8400/AD8402/AD8403 ≤ +125 C unless otherwise noted Min Typ Max ± 1/4 –1 +1 ± 1/2 – 100 130 500 53 100 = 25°C ...
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... AD8400/AD8402/AD8403–SPECIFICATIONS ELECTRICAL CHARACTERISTICS–1 k VERSION Parameter DC CHARACTERISTICS RHEOSTAT MODE Specifications Apply to All VRs 2 Resistor Differential NL 2 Resistor Nonlinearity 3 Nominal Resistance Resistance Tempco Wiper Resistance Nominal Resistance Match DC CHARACTERISTICS POTENTIOMETER DIVIDER Specifications Apply to All VRs Resolution 4 Integral Nonlinearity 4 Differential Nonlinearity Voltage Divider Temperature Coefficent ...
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... OUT) CLK OUT OUT ERROR BAND DD AD8400/AD8402/AD8403 ≤ +125 C unless otherwise noted Min Typ Max (10 and timed from a voltage level ...
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... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD8400/AD8402/AD8403 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...
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... AD8402AN1 2 AD8402AR1 2 AD8402ARU1 2 AD8402ARU1-REEL 2 AD8403AN1 4 AD8403AR1 4 AD8403ARU1 4 AD8403ARU1-REEL 4 NOTES N = Plastic DIP Small Outline Thin Shrink SO The AD8400, AD8402, and AD8403 contain 720 transistors. ORDERING GUIDE End-to-End Temperature Package Range ( C) Description AB 10 –40 to +125 PDIP-8 10 –40 to +125 SO-8 10 –40 to +125 PDIP-14 10 – ...
Page 8
... Positive power supply, specified for operation DD at both 3 V and Wiper RDAC #1, Addr = Terminal A RDAC # Terminal B RDAC #1 All AGNDs must be connected to DGND. AD8400 PIN FUNCTION DESCRIPTIONS Pin Name GND CLK 4 SDI B1 ...
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... Typical Performance Characteristics–AD8400/AD8402/AD8403 10k 128 160 192 224 256 CODE – Decimal 1205 UNITS 40.0 42.5 45.0 47.5 50.0 52.5 55.0 57.5 60.0 62.5 65.0 WIPER RESISTANCE – Ω 184 UNITS ...
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... AD8400/AD8402/AD8403 700 600 T = –40 C/+ CONNECT A 500 R MEASURED WB 400 300 200 100 0 –100 128 160 192 224 256 CODE – Decimal ∆ ∆ 0.75 CODE = 0. 158 UNITS AVG + 2 SIGMA 0.25 AVG 0 –0.25 AVG – 2 SIGMA –0.50 – ...
Page 11
... B A 200 10k 100k 1M 10M FREQUENCY – Hz 100 –55 –35 – 105 125 TEMPERATURE – C AD8400/AD8402/AD8403 + p CODE = 10pF 4V SEE TEST CIRCUIT 4 0 100 1k 10k 100k FREQUENCY – ...
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... AD8400/AD8402/AD8403 TEST CIRCUITS DUT 1LSB = V+/256 CONNECT DUT DUT 1V/R W NOMINAL WHERE AND PSRR (dB) = 20LOG PSS (%/%) = ––––––– ...
Page 13
... The single-channel AD8400 requires The dual- channel AD8402 requires settings can be changed one at a time in random sequence. The serial clock running at 10 MHz makes it possible to load all four VRs in under 4 µs (10 × 4 × 100 ns) for the AD8403. The exact timing requirements are shown in Figures 2a, 2b, and 2c ...
Page 14
... Terminal B to the wiper. See TPC 9 for a plot of potentiometer tempco performance versus code setting. DIGITAL INTERFACING The AD8400/AD8402/AD8403 contain a standard SPI compat- ible three-wire serial input control interface. The three inputs are clock (CLK), CS and serial data input (SDI). The positive- edge sensitive CLK input requires clean transitions to avoid clocking incorrect data into the serial input register ...
Page 15
... ESD protection allows for mixed power supply applications where 5 V CMOS logic can be used to drive an AD8400, AD8402, or AD8403 operating from power sup- ply. The analog pins A, B, and W are protected with a 20 Ω series resistor and parallel Zener (see Figure 7b). ...
Page 16
... Test Circuits 1 and 2 (see page 11). Certain boundary conditions must be satisfied for proper AD8400/ AD8402/AD8403 operation. First, all analog signals must remain within the range used to operate the single-supply DD AD8400/AD8402/AD8403 products ...
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... P –20 –40 –60 – 0.01 F LOW PASS RDAC3 A4 –20 BAND- PASS –40 HIGH- –60 PASS –80 20 AD8400/AD8402/AD8403 –0.16 20.0000 k A 100 1k 10k 100k 200k FREQUENCY – Hz –19.01 2.00000 k A 100 1k 10k 100k 200k FREQUENCY – Hz ...
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... AD8400/AD8402/AD8403 0.210 (5.33) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Lead Plastic DIP (N-8) 0.430 (10.92) 0.348 (8.84 0.280 (7.11) 0.240 (6.10 0.325 (8.25) PIN 1 0.100 (2.54) 0.300 (7.62) BSC 0.060 (1.52) 0.210 0.015 (0.38) (5.33) MAX 0.130 (3.30) 0.160 (4.06) MIN 0.115 (2.93) 0.015 (0.381) 0.022 (0.558) 0.070 (1.77) SEATING 0.008 (0.204) PLANE 0.014 (0.356) ...
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... PIN 1 0.060 (1.52) 0.015 (0.38) 0.210 (5.33) 0.150 MAX (3.81) 0.200 (5.05) MIN 0.125 (3.18) 0.100 0.022 (0.558) 0.070 (1.77) SEATING (2.54) PLANE 0.014 (0.356) 0.045 (1.15) BSC AD8400/AD8402/AD8403 0.0196 (0.50) 45 0.0099 (0.25 0.0500 (1.27) 0.0160 (0.41 0.028 (0.70) 0.020 (0.50) 0.325 (8.25) 0.300 (7.62) 0.195 (4.95) 0.115 (2.93) 0.015 (0.381) 0.008 (0.204) ...
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... AD8400/AD8402/AD8403 PIN 1 0.0118 (0.30) 0.0040 (0.10) PIN 1 0.006 (0.15) 0.002 (0.05) SEATING PLANE Revision History Location Data Sheet changed from REV REV. C. Addition of new Figure Edits to SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Edits to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Edits to TPCs 1, 8, 12, 16, 20, 24 Edits to PROGRAMMING THE VARIABLE RESISTOR section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 OUTLINE DIMENSIONS (continued) Dimensions shown in inches and (mm) ...