SKU: ZBX-324
ZBX-324 ANALOG INPUT/OUTPUT MODULE
The ZBX-324 is a combination analog input and analog output module. Two 8-bit analog to digital converters and two 8-bit digital to analog converters are contained on the ZBX-324. In addition, the module contains an on-board precision voltage reference.
Analog to Digital Converter
The ADC section consists of two Analog Devices AD7574 CMOS ADC circuits. These devices use the successive-approximation technique to provide a fast conversion time of 15 uS. Additional features include 8-bit resolution, internal clock, on-chip comparator and low (30mW) power dissipation. An Analog Devices AD581 provides a precision voltage reference of 10,000 V +5mV.
The conversion process is started by a read of the data port. During the conversion process, the ZBX-324 generates an MWAIT/until the conversion process is complete. When the conversion data is valid, the MWAIT/ signal is de-asserted to allow the CPU to proceed.
Digital to Analog Converter
he DAC section consists of two Analog Devices AD558 Dacport
DAC circuits. The AD 558 Dacport is a complete voltage output 8-bit digital to analog converter, including output amplifier, full microprocessor interface and precision voltage reference on a single monolithic chip. The voltage-switching structure of the AD558 provides a jumper selectable output range of 2.56V or 10.0V. Circuitry is internally compensated for minimum settling time on both ranges; typically settling to + 1/2 LSB for a full-scale 2.55 volt step in 800 ns.
TECHNICAL SPECIFICATIONS
Word Size
Data 8 bits
On-Board Voltage Reference
10,000 Volts +5mV max.
I/O Addressing
Analog input #1 x0 or x4
Analog input #2 x1 or x5
Analog Output #1 x2 or x6
Analog Output #2 x3 or x7
Note: "x" indicates a base port address which is determined by the host baseboard. Refer to the baseboard hardware reference for specifics.
ADC Section
Input Range 0 to +10V Adjustable
Accuracy
Resolution 8 bits
Relative Error +/- 3/4 LSB max
Differential
Nonlinearity +/- 7/8 LSB max
Full Scale Error
(Gain Error) +/- 5 LSB max
Offset Error +/- 60 mV max
Conversion Time
Minimum 15 uS. , Typical 18 uS.
DAC Section
Output Range 0 to +2.56V or +10.0V selectable
Accuracy
Resolution 8 bits
Relative Accuracy +/- 1/2 LSB max
Full Scale @ 25 C +/- 1.5 (+/- 0.6%) max
Output Settling Time
0 to 2.56V Range 0.8 uS. (1.5 uS. max)
0 to 10.0V Range 2.0 uS. (3.0 uS. max)
Interface
ZBX Bus All signals TTL compatible and per Intel SBX bus specification
Physical
Width: 2.5 inches (6.35 cm)
Length: 3.7 inches (9.40 cm)
Height: 0.87 inches (2.2 cm) ZBX-324 only , 1.06 inches (2.7 cm) including baseboard
Weight: 1.55 oz. (44 gm); 1 lb. shipping weight
Environmental: 0 to 55 C, 5 - 95% RH (no condensation)
Power Requirements (Typical)
+5 Volts 10 mA
+12 Volts 50 mA
-12 Volts 1 mA
