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RCV420KP Datasheet(PDF) 9 Page - Texas Instruments |
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RCV420KP Datasheet(HTML) 9 Page - Texas Instruments |
9 / 12 page ® RCV420 9 1 2 3 15 14 V RCV420 12 13 5 OPA237 O 20k Ω 10 11 C T 4–20mA (5–0V) +6.25V 12k Ω +10V +6.25V R S R S C T 1 2 3 RCV420 –In +In 15 14 12 5 V O I 1 I 2 13 R S R S C T 1 2 3 RCV420 –In +In 10 11 12 15 14 13 4–20mA 5 (1) V O (0–5V) R S R S C T 1 2 3 RCV420 –In +In 10 11 12 15 14 13 5 (N) V O (0–5V) R CM (1) R G (1) FIGURE 10. Series 4-20mA Receivers. FIGURE 13. Power Supply Current Monitor Circuit. FIGURE 12. 4-20mA to 5-0V Conversion. VO = 6.25V – (0.3125) (IIN) NOTE: (1) RCM and RG are used to provide a first order correction of CMR and Gain Error, respectively. Table 1 gives typical resistor values for RCM and RG when as many as three RCV420s are stacked. Table II gives typical CMR and Gain Error with no correction. Further improvement in CMR and Gain Error can be achieved using a 500k Ω potentiometer for RCM and a 100Ω potentiometer for RG. RCV420 RCM (kΩ)RG (Ω) 1 ∞ 0 2 200 7 367 23 TABLE 1. Typical Values for RCM and RG. TABLE II. Typical CMR and Gain Error Without Correction. RCV420 CMR (dB) GAIN ERROR % 1 94 0.025 2 68 0.075 3 62 0.200 FIGURE 11. Differential Current-to-Voltage Converter. V O = 0.3125 (I1 – I2) Max Gain Error = 0.1% (RCV420BG) ( I L MAX 16mA –1 ) NOTE: (1) R X = RS/ C T 15 5 12 13 3 2 1 14 RCV420 +In +In Load Load Power Supply C T 15 5 12 13 14 RCV420 –In I L +In Power Supply –40V (max) +40V (max) R X (1) R X (1) R X (1) R X (1) R S R S R S R S V O (0-5V) V O (0-5V) I L |
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