10-Bit A/D Converter with Serial Interface CMOS

These ratiometric 10-bit ADCs have serial interface ports to provide communication with MCUs and MPUs. Either a 10- or 16-bit format can be used. The 16-bit format can be one continuous 16-bit stream or two intermittent 8-bit streams. The converters operate from a single power supply with no external trimming required. Reference voltages down to 4.0 V are accommodated.
The MC145050 has the same pin out as the 8-bit MC145040 which allows an external clock (ADCLK) to operate the dynamic A/D conversion sequence. The MC145051 has the same pin out as the 8-bit MC145041 which has an internal clock oscillator and an end-of-conversion (EOC) output.

• 11 Analog Input Channels with Internal Sample-and-Hold
• Operating Temperature Range: – 40 to 125° C
• Successive Approximation Conversion Time:
   MC145050 — 21 µs (with 2.1 MHz ADCLK)
   MC145051 — 44 µs Maximum
• Maximum Sample Rate: MC145050 — 38 ks/s
                                  MC145051 — 20.4 ks/s
• Analog Input Range with 5-Volt Supply: 0 to 5 V
• Monotonic with No Missing Codes
• Direct Interface to Motorola SPI and National MICROWIRE Serial Data Ports
• Digital Inputs/Outputs are TTL, NMOS, and CMOS Compatible
• Low Power Consumption: 14 mW
• Chip Complexity: 1630 Elements (FETs, Capacitors, etc.)
• See Application Note AN1062 for Operation with QSPI