Ordering number : EN *5428A CMOS LSI LC89086M 8 Bit A/D Converter Preliminary Overview Package Dimensions The LC89086M is a low-power high-speed 8-bit serialparallel A/D converter fabricated in a high-speed CMOS process. unit: mm 3155-MFP24 [LC89086M] Features • • • • • • • Resolution: 8 bits (with an overflow output) Maximum conversion rate: 20M samples per second Error: Less than ±1.0 LSB Power supply: +5-V single-voltage power supply Power dissipation: 150 mW (typical) Analog input voltage range: VSS to VDD Digital output voltage: 3 state TTL level SANYO: MFP24 Specifications Absolute Maximum Ratings at Ta = 25°C, DVSS = AVSS = 0 V Parameter Symbol Conditions Ratings Unit Maximum supply voltage VDD max –0.3 to +7.0 V Input voltage VIN max –0.3 to VDD +0.3 V Operating temperature Topr –30 to +70 °C Storage temperature Tstg –40 to +125 °C Recommended Operating Conditions Parameter Supply voltage Operating ambient temperature Symbol Conditions Ratings min VDD 4.5 Ta –30 typ 5.0 max Unit 5.5 V +70 °C SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN O3097HA (OT) No. 5428-1/6 LC89086M Electrical Characteristics Electrical DC Characteristics at Ta = –30 to +70°C, AVDD = DVDD = 4.5 to 5.5 V, AVSS = DVSS = 0 V Parameter Symbol Reference resistance Rref Analog input capacitance CAIN Analog input resistance RAIN Ratings Conditions min VrefH (pin 5) – VrefL (pin 8) When VrefHO (pin 4) and VrefLO (pin 9) are unused. typ 210 Reference high-level input voltage VrefH Reference low-level input voltage VrefL When VrefHO (pin 4) and VrefLO (pin 9) are unused. Reference high-level output voltage VrefH When VrefHO (pin 4) and VrefLO (pin 9) are used, and AVDD = DVDD = 5 V 1.9 Reference low-level output voltage VrefL When VrefHO (pin 4) and VrefLO (pin 9) are used, and AVDD = DVDD = 5 V –0.05 Unit max 300 390 Ω 30 pF 10 MΩ Vref L + 2.0 VDD V VrefH – 2.0 V 2.0 2.1 V 0 +0.05 V V 0 Analog input voltage VAIN VrefL VrefH Digital high-level voltage VIH 2.2 VDD +0.3 V Digital low-level voltage VIL –0.3 +0.8 V Digital high-level output current IOH VOH = VDD – 0.4 V Digital low-level output current IOL VOL = 0.4 V –2 mA 2 mA Electrical AC Characteristics 1 at Ta = –30 to +70°C, AVDD = DVDD = 4.5 to 5.5 V, AVSS = DVSS = 0 V Parameter Symbol Conditions Ratings min typ Unit max Clock high-level period TWH 23 Clock low-level period TWL 23 Analog input acquisition time TAP 10 20 30 Digital output data delay time Td C load = 30 pF 15 30 45 ns Digital output data enable time TOE C load = 30 pF 2 5 10 ns Digital output data disable time TOD C load = 30 pF 2 5 10 ns ns ns ns No. 5428-2/6 LC89086M Timing Chart 1.5 V Clock input (CLK) TWH TAP TWL N+3 Analog input (AIN) N+2 N N+1 Td Digital output (D8 to D1,OF) N–4 N–3 N –2 Output enable input (OEB) N 1.5 V 1.5V TOE Digital output (D8 to D1,OF) N–1 TOD High impedance A09018 The analog signal (AIN) is acquired on the falling edge of the clock input (CLK). The acquired analog signal is converted to a digital code and is output from the digital outputs (D8 to D1, OF) on the clock falling edge delayed three clock cycles from the clock cycle in which the analog signal was acquired. Electrical AC Characteristics 2 at Ta = 25°C, AVDD = DVDD = 5 V, AVSS = DVSS = 0 V, VrefH = 2 V, VrefL = 0 V Parameter Resolution Maximum conversion rate Linearity error Differential linearity error Offset voltage Power dissipation Symbol Conditions Ratings min typ Unit max Res 8 bit Fs 20 MSPS LE DC accuracy ±1.0 LSB DLE DC accuracy ±1.0 LSB Voffset DC accuracy Pd Fs = 20 MSPS 10 50 90 mV 150 220 mW Note: Test circuits must conform to the sample application circuit. No. 5428-3/6 LC89086M Block Diagram OEB 5 VrefM 7 VrefL Resistor string 8 Reference voltage generation 4 9 VrefHO VrefLO Output register VrefH Upper comparator Lower encoder 6 Lower comparator AIN Upper encoder Lower Vref selection Data correction 1 Clock generation 22 OF 21 D1(MSB) 14 D8(LSB) 23 CLK A09019 Pin Assignment Top view No. 5428-4/6 LC89086M Pin Functions Pin No. Pin name 1 OEB I/O Function Digital output enable input High: high-impedance Low: Normal operation I 2 DVSS Digital ground 3 AVSS Analog ground 4 Vref HO O Internal reference voltage (high) generation. Shorting this pin to VrefH (pin 5) generates a voltage of 2.0 V. This pin must be left open when the internally generated potential is not used. 5 Vref H I Reference voltage input (high) 6 AIN I Analog input 7 Vref M O Reference voltage intermediate level tap. 8 Vref L I Reference voltage input (low) 9 Vref LO O Internal reference voltage (low) generation. Shorting this pin to VrefL (pin 8) generates a voltage of 0 V. This pin must be left open when the internally generated potential is not used. 10 AVDD Analog power supply 11 AVSS Analog ground 12 DVSS Digital ground 13 DVDD 14 D8 O Digital output (LSB) 15 D7 O Digital output 16 D6 O Digital output 17 D5 O Digital output 18 D4 O Digital output 19 D3 O Digital output 20 D2 O Digital output 21 D1 O Digital output (MSB) 22 OF O Digital output (Overflow) 23 CLK I 24 DVDD Digital power supply Clock input Digital power supply Note: There must be no potential difference between the digital system and analog system VDD and VSS power supply potentials. I/O Code Table The table below lists the relationship between the input and output when VrefH and VrefL are set up so that the zero transient voltage is 0.000 V and the full-scale transient voltage is 2.008V. Analog input VAIN (V) Digital output OF D1 D2 D3 D4 D5 D6 D7 D8 Up to 0.000 0 0 0 0 0 0 0 0 0 Up to 0.008 0 0 0 0 0 0 0 0 0 Up to 0.016 0 0 0 0 0 0 0 0 1 Up to 0.024 0 0 0 0 0 0 0 1 0 Up to 0.032 0 0 0 0 0 0 0 1 1 Up to 0.992 0 0 1 1 1 1 1 1 0 Up to 1.000 0 0 1 1 1 1 1 1 1 Up to 1.008 0 1 0 0 0 0 0 0 0 Up to 1.016 0 1 0 0 0 0 0 0 1 Up to 1.992 0 1 1 1 1 1 1 0 1 Up to 2.000 0 1 1 1 1 1 1 1 0 Up to 2.008 0 1 1 1 1 1 1 1 1 Over 2.008 1 1 1 1 1 1 1 1 1 to to No. 5428-5/6 LC89086M Sample Application Circuit : Digital VDD(5V) 100 µ Output enable in 0.01 µ 100 µ 1 OEB DVDD 24 2 DVSS CLK 23 0.01 µ : Analog VDD(5V) : Digital Ground Clock in : Analog Ground *1 3 AVSS 4 VrefHO 0.01 µ 5 VrefH Analog in *2 10 µ 6 AIN CLAMP 7 VrefM 8 VrefL 100 µ 9 VrefLO 0.01 µ *1 LC 89086M 100 µ OF 22 Overflow flag out D1 (MSB) 21 D2 20 D3 19 D4 18 Digital out D5 17 D6 16 10 AVDD D7 15 11 AVSS D8 (LSB) 14 12 DVSS DVDD 13 Unit (capacitance: F) 1µ Note 1. The value of the reference resistor is about 300 Ω. When this circuit is used with (VrefH – VrefL) = 2 V, a current of 6.7 mA will flow. Use an operational amplifier or emitter follower with at least this current capacity. 2. The analog input impedance is lower for AC inputs. Therefore, an operational amplifier or emitter follower with a high slew rate and a wide bandwidth must be used in the previous stage output, and the impedance must be reduced to under 100 Ω. ■ No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. ■ Anyone purchasing any products described or contained herein for an above-mentioned use shall: ➀ Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: ➁ Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. ■ Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of October, 1997. Specifications and information herein are subject to change without notice. No. 5428-6/6