MC145483SDR2 Freescale, MC145483SDR2 Datasheet - Page 7

• Manufacturer Part Number: MC145483SDR2
• Manufacturer: Freescale
• Type: PCMr

Specifications of MC145483SDR2

• Number Of Channels: 1
• Gain Control: Adjustable
• Number Of Adc's: 1
• Number Of Dac's: 1
• Adc/dac Resolution: 13b
• Package Type: SSOP
• Sample Rate: 8KSPS
• Number Of Adc Inputs: 1
• Number Of Dac Outputs: 1
• Operating Supply Voltage (min): 2.7V
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Pin Count: 20
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

DIGITAL I/O
ment data format. Table 2 shows the 13–bit data word format
for the maximum positive code and negative zero and full–
scale.
correspond to a digital milliwatt. The digital milliwatt is the
1 kHz calibration signal reconstructed by the DAC that de-
fines the absolute gain or 0 dBm0 transmission level point
(TLP) of the DAC. The calibration level for this 13–bit linear
ADC and DAC is referenced to Mu–Law with the same bit
voltage weighting about the zero crossing. This results in the
0 dBm0 calibration level being 3.20 dB below the peak sinu-
soidal level before clipping. Refer to Figures 2a–2d for a
summary and comparison of the four PCM data interface
modes of this device.
The MC145483 is a 13–bit linear device using 2s comple-
Table 3 shows the series of eight 13–bit PCM words that
Freescale Semiconductor, Inc.
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Table 3. PCM Codes for 1 kHz Digital Milliwatt
Table 2. PCM Codes for Zero and Full–Scale
+ Full Scale
– Full Scale
+ One Step
– One Step
Level
Level
11π/8
13π/8
15π/8
Zero
3π/8
5π/8
7π/8
9π/8
π/8
Sign Bit
Sign Bit
0
0
0
1
1
Magnitude Bits
0000 0000 0001
0000 0000 0000
0000 0000 0000
Magnitude Bits
1111 1111 1111
1111 1111 1111
MC145483