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AD53508 Arkusz danych(PDF) 6 Page - Analog Devices |
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AD53508 Arkusz danych(HTML) 6 Page - Analog Devices |
6 / 8 page AD53508 –6– REV. 0 PPMU APPLICATION NOTES The PPMU can be used in two modes: 1. VOLTAGE FORCE with CURRENT MEASURE or VERIFY CURRENT FORCE; 2. CURRENT FORCE with VOLTAGE MEASURE or VERIFY VOLTAGE FORCE. In both modes the following setup is recommended: 1. The value of the external integrate capacitor (EXT_RC to C1) is 10 nF. 2. MEAS_OUT pin is loaded with 1 M Ω to ground. 3. VCC = +15.0 V, VDD = +4.5 V, DIGGND = 0.0 V, VEE = –10 V, DSR = 2.5 V unless otherwise stated. 4. A 10 Ω resistor in series with the FORCE pin. 5. A 1 k Ω resistor in series with the SENSE pin. IN VOLTAGE FORCE WITH CURRENT MEASURE OR VERIFY CURRENT FORCE To measure the leakage in the current measure and hold mode, the PPMU has to be into the Force Voltage/Measure Current Integrate mode. 1. The FORCE_A (Force Output) pin has to be programmed to +9 V. 2. The PPMU has to be programmed to INTEGRATE mode. 3. The PPMU has to be programmed to HOLD mode. 4. Sample MEAS_OUT. 5. Wait 100 ms. 6. Sample MEAS_OUT again. 7. The difference between 2 and 4 must be less than 15 mV. The linearity tests for forcing voltage are as follows (at the FORCE pin): 1. The four ranges of CURRENT MEASURE ranges (200 nA, 20 µA, 200 µA, and 2 mA) correspond to F1, F2, F3, and F4. 2. The endpoints of the linearity curve are determined by –full scale (or LOW), and the +full scale (or HIGH) readings at the same FORCE pin current. 3. Using these endpoints, gain nonlinearity is computed and tested at the 1/4 scale, 1/2 scale, and 3/4 scale points. S11 S12 S13 S14 S15 S16 INT/IM R1 R2 INTEGRATE S10 UNITY DIFF VF S4 IF S5 C1 1k 2mA 10k 200 A EXT RC SENSE S8 S9 S2 S3 VM IM ENABLE S1 CON 2.5V S6 S7 FORCING VOLTAGE DAC1 DAC2 DSR MEAS OUT 40pF S17 GUARD FORCE SENSE R R 1.25R 1.25R MAIN GUARD S18 AD53508 OUTPUT 1k 10 TO DUT Figure 2. Guarded Voltage Force/Current Measure, IRANGE 1: I ≤ 2 mA 4. Computations for F1 are: F1 × 0.25 = LOW + 1 × (HIGH – LOW)/4 F1 × 0.50 = LOW + 2 × (HIGH – LOW)/4 F1 × 0.75 = LOW + 3 × (HIGH – LOW)/4 Where LOW = –Full Scale and HIGH = +Full Scale. The linearity tests for measuring current are as follows (at the MEAS_OUT pin): 1. The voltage is constant for these measurements. 2. The four ranges (M1, M2, M3, M4) correspond to CURRENT MEASURE ranges (200 nA, 20 µA, 200 µA, and 2 mA respectively). 3. The endpoints of the linearity curve are determined by the –full scale (or LOW), and the +full scale (or HIGH) read- ings at the same FORCE pin voltage. 4. Using these endpoints, gain nonlinearity is computed and tested at the 1/4 scale, 1/2 scale, and 3/4 scale points. 5. Computations for M1 are: M1 × 0.25 = LOW + 1 × (HIGH – LOW)/4 M1 × 0.50 = LOW + 2 × (HIGH – LOW)/4 M1 × 0.75 = LOW + 3 × (HIGH – LOW)/4 Where LOW = –Full Scale, and HIGH = +Full Scale. The M_CON pin can be used for disconnecting the MEAS_OUT pin by: 1. Raising M_CON to 2.4 V. 2. Measuring MEAS_OUT (which is loaded with 100 k Ω). 3. MEAS_OUT should ideally be 0 V. The OUTPUT_CON pin can be used for disconnecting the DUT by: 1. Disabling the SENSE pin (OUTPUT_CON = 2.4 V). 2. Loading FORCE_OUT with 2 k Ω to ground. 3. Programming the DAC1 input to +FS (+9 V) and measuring the FORCE_OUT voltage (FV1). 4. Programming the DAC1 input to –FS (–4 V) and measur- ing the FORCE_OUT voltage (FV2). 5. FV1–FV2 < 1.3 mV. 6. A change of 1.3 mV implies a switch off-resistance of 20 M Ω. |
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