Rainbow Electronics MAX1329 - Manual (Page 24)

MAX1329/MAX1330
12-/16-Bit DASs with ADC, DACs, DPIOs, APIOs,
Reference, Voltage Monitors, and Temp Sensor
24 ______________________________________________________________________________________
Pin Description (continued)
PIN
MAX1329 MAX1330
NAME FUNCTION
24 24 OUTA DACA Force-Sense Output. Also internally connected to ADC mux.
25 25 FBA DACA Force-Sense Feedback Input. Also internally connected to ADC mux.
26 26 REFDAC
DAC Internal Reference Buffer Output/DAC External Reference Input. In internal reference
mode, REFDAC provides a 1.25V, 2.048V, or 2.5V internal reference buffer output. In
external DAC reference buffer mode, disable internal reference buffer. Bypass REFDAC to
AGND with a 1µF capacitor.
27 27 SNC2 Analog Switch 2 Normally-Closed Terminal
28 28 SCM2 Analog Switch 2 Common Terminal
29 29 SNO2 Analog Switch 2 Normally-Open Terminal
30 30 AIN2 Analog Input 2. Also internally connected to ADC mux.
31 31 AIN1 Analog Input 1. Also internally connected to ADC mux.
32 32 REFADC
ADC Internal Reference Buffer Output/ADC External Reference Input. In internal reference
mode, REFADC provides a 1.25V, 2.048V, or 2.5V internal reference buffer output. In
external ADC reference buffer mode, disable internal reference buffer. Bypass REFADC to
AGND with a 1µF capacitor.
33 33 REFADJ
Internal Reference Output/Reference Buffer Amplifiers Input. In internal reference mode,
bypass REFADJ to AGND with a 0.01µF capacitor. In external reference mode, disable
internal reference.
34 34 AGND Analog Ground
35 35 AV DD
Analog Supply Input. Bypass AV DD to AGND with at least a 0.01µF capacitor. With the
charge pump enabled, see Table 32 for required capacitor values.
36 36 C1B
Charge-Pump Capacitor Input B. Connect C FLY across C1A and C1B. See Table 32 for
required capacitor values.
37 37 C1A
Charge-Pump Capacitor Input A. Connect C FLY across C1A and C1B. See Table 32 for
required capacitor values.
38 38 DV DD
Digital Supply Input. Bypass DV DD to DGND with at least a 0.01µF capacitor. When using
charge pump, see Table 32 for required capacitor values.
39 39 DGND Digital Ground
40 40 CLKIO
Clock Input/Output. In internal clock mode, enable CLKIO output for external use. In
external clock mode, apply a clock signal at CLKIO for the ADC and charge pump.
— — EP
Exposed Pad. The exposed pad is located on the package bottom and is internally
connected to AGND. Connect EP to the analog ground plane. Do not route any PCB traces
under the package.