AD7730L Analog Devices, AD7730L Datasheet - Page 11

• Manufacturer Part Number: AD7730L
• Description: CMOS, 24-Bit Low Power Sigma-Delta ADC for Bridge Transducer Applications
• Manufacturer: Analog Devices

Specifications of AD7730L

• Resolution (bits): 24bit
• # Chan: 2
• Sample Rate: 5MSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Bip,Diff-Uni
• Ain Range: (2Vref/PGA Gain) p-p,(Vref/PGA Gain) p-p
• Adc Architecture: Sigma-Delta
• Pkg Type: SOIC,SOP

Output
Data Rate Frequency
150 Hz
200 Hz
300 Hz
600 Hz
1200 Hz
Output
Data Rate Frequency
150 Hz
200 Hz
300 Hz
600 Hz
1200 Hz
ON-CHIP REGISTERS
The AD7730 contains thirteen on-chip registers which can be accessed via the serial port of the part. These registers are summarized
in Figure 4 and in Table V and described in detail in the following sections.
REV. A
5.85 Hz
7.8 Hz
11.7 Hz
23.4 Hz
46.8 Hz
–3 dB
5.85 Hz
7.8 Hz
11.7 Hz
23.4 Hz
46.8 Hz
–3 dB
SF
Word
2048
1536
1024
512
256
SF
Word
2048
1536
1024
512
256
Table IV. Peak-to-Peak Resolution vs. Input Range and Update Rate (CHP = 0)
DIN
DOUT
Table III. Output Noise vs. Input Range and Update Rate (CHP = 0)
166 ms
125 ms
83.3 ms
41.6 ms
20.8 ms
Settling Time
Normal Mode
166 ms
125 ms
83.3 ms
41.6 ms
20.8 ms
Settling Time
Normal Mode
DOUT
DOUT
DOUT
DOUT
DOUT
DOUT
DOUT
DOUT
Peak-to-Peak Resolution in Counts (Bits)
DIN
DIN
DIN
DIN
DIN
DIN
Typical Output RMS Noise in nV
DIN
Figure 4. Register Overview
Settling Time
Fast Mode
26.6 ms
20 ms
13.3 ms
6.6 ms
3.3 ms
Settling Time
Fast Mode
26.6 ms
20 ms
13.3 ms
6.6 ms
3.3 ms
COMMUNICATIONS REGISTER
OFFSET REGISTER (x3)
GAIN REGISTER (x3)
STATUS REGISTER
FILTER REGISTER
MODE REGISTER
DATA REGISTER
DAC REGISTER
TEST REGISTER
–11–
RS2 RS1 RS0
Input Range
= 80 mV
160
190
235
300
435
Input Range
= 80 mV
165k (17.5)
140k (17)
115k (17)
90k (16.5)
60k (16)
120k (17)
100k (16.5)
90k (16.5)
60k (16)
Input Range
= 40 mV
110
130
145
225
315
Input Range
= 40 mV
43k (15.5)
REGISTER
DECODER
SELECT
Input Range
= 20 mV
80
95
100
135
210
Input Range
= 20 mV
80k (16.5)
70k (16)
65k (16)
50k (15.5)
32k (15)
AD7730/AD7730L
Input Range
= 10 mV
60
75
80
110
150
Input Range
= 10 mV
55k (16)
45k (15.5)
40k (15.5)
30k (15)
20k (14.5)