ADC12H034CIMSA/NOPB National Semiconductor, ADC12H034CIMSA/NOPB Datasheet - Page 37

• Manufacturer Part Number: ADC12H034CIMSA/NOPB
• Description: ADC 12BIT W/S&H +SIGN 24-SSOP
• Manufacturer: National Semiconductor

Specifications of ADC12H034CIMSA/NOPB

• Number Of Bits: 12
• Data Interface: NSC MICROWIRE™, Serial
• Number Of Converters: 4
• Power Dissipation (max): 33mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SSOP (0.200", 5.30mm Width)
• Number Of Elements: 1
• Architecture: SAR
• Input Polarity: Unipolar
• Input Type: Voltage
• Rated Input Volt: 5V
• Differential Input: Yes
• Power Supply Requirement: Analog and Digital
• Single Supply Voltage (typ): 5V
• Single Supply Voltage (min): 4.5V
• Single Supply Voltage (max): 5.5V
• Dual Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Power Dissipation: 500mW
• Differential Linearity Error: ±1LSB
• Integral Nonlinearity Error: ±1LSB
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 24
• Package Type: SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ADC12H034CIMSA

The assignment of the RS-232 port is shown below
A sample program, written in Microsoft QuickBasic, is shown
on the next page. The program prompts for data mode select
instruction to be sent to the ADC. This can be found from the
Mode Programming table shown earlier. The data should be
entered in “1”s and “0”s as shown in the table with DI0 first.
Next, the program prompts for the number of SCLK cycles
required for the programmed mode select instruction. For in-
stance, to send all “0”s to the ADC, selects CH0 as the +input,
CH1 as the −input, 12-bit conversion, and 13-bit MSB first
data output format (if the sign bit was not turned off by a pre-
vious instruction). This would require 13 SCLK periods since
the output data format is 13 bits.
The ADC powers up with No Auto Cal, No Auto Zero, 10
CCLK Acquisition Time, 12-bit conversion, data out with sign,
COM1
Input Address
Output Address
3FC
3FE
B7
X
X
37
B6
X
X
power up, 12- or 13-bit MSB first, and user mode. Auto Cal,
Auto Zero, Power Up and Power Down instructions do not
change these default settings. The following power up se-
quence should be followed:
1.
2.
3.
It is recommended that the first instruction issued to the
ADC12038 be Auto Cal (see Section 1.1 Interface Con-
cepts).
B5
X
X
Run the program
Prior to responding to the prompt apply the power to the
ADC12038
Respond to the program prompts
CTS
B4
0
B3
X
X
B2
X
X
RTS
B1
X
DTR
B0
X
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