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R8C/38M Group 5. Electrical Characteristics Under development Preliminary document Specifications in this document are tentative and subject to change. R01DS0082EJ0110 Rev.0.10 Page 31 of 55 Mar 04, 2011 Notes: 1. VCC/AVCC = Vref = 2.2 to 5.5 V, VSS = 0 V, and Topr = −20 to 85 °C (N version)/−40 to 85 °C (D version), unless otherwise specified. 2. The A/D conversion result will be undefined in wait mode, stop mode, when the flash memory stops, and in low-current- consumption mode. Do not perform A/D conversion in these states or transition to these states during A/D conversion. 3. When the analog input voltage is over the reference voltage, the A/D conversion result will be 3FFh in 10-bit mode and FFh in 8-bit mode. Table 5.3 A/D Converter Characteristics Symbol Parameter Conditions Standard Unit Min. Typ. Max. — Resolution Vref = AVCC —— 10 Bit — Absolute accuracy 10-bit mode Vref = AVCC = 5.0 V AN0 to AN7 input, AN8 to AN11 input, AN12 to AN19 input —— ±3 LSB Vref = AVCC = 3.3 V AN0 to AN7 input, AN8 to AN11 input, AN12 to AN19 input —— ±5 LSB Vref = AVCC = 3.0 V AN0 to AN7 input, AN8 to AN11 input, AN12 to AN19 input —— ±5 LSB Vref = AVCC = 2.2 V AN0 to AN7 input, AN8 to AN11 input, AN12 to AN19 input —— ±5 LSB 8-bit mode Vref = AVCC = 5.0 V AN0 to AN7 input, AN8 to AN11 input, AN12 to AN19 input —— ±2 LSB Vref = AVCC = 3.3 V AN0 to AN7 input, AN8 to AN11 input, AN12 to AN19 input —— ±2 LSB Vref = AVCC = 3.0 V AN0 to AN7 input, AN8 to AN11 input, AN12 to AN19 input —— ±2 LSB Vref = AVCC = 2.2 V AN0 to AN7 input, AN8 to AN11 input, AN12 to AN19 input —— ±2 LSB φAD A/D conversion clock 4.0 V 2— 20 MHz 3.2 V 2— 16 MHz 2.7 V 2— 10 MHz 2.2 V 2—5 MHz — Tolerance level impedance — 3 — k Ω tCONV Conversion time 10-bit mode Vref = AVCC = 5.0 V, φAD = 20 MHz 2.2 — — µs 8-bit mode Vref = AVCC = 5.0 V, φAD = 20 MHz 2.2 — — µs tSAMP Sampling time φAD = 20 MHz 0.8 — — µs IVref Vref current VCC = 5.0 V, XIN = f1 = φAD = 20 MHz — 45 — µA Vref Reference voltage 2.2 — AVCC V VIA Analog input voltage (3) 0— Vref V OCVREF On-chip reference voltage 2 MHz ≤ φAD ≤ 4 MHz 1.19 1.34 1.49 V |
