AD7707BR Analog Devices Inc, AD7707BR Datasheet - Page 14

• Manufacturer Part Number: AD7707BR
• Description: A/D Converter (A-D) IC
• Manufacturer: Analog Devices Inc

Specifications of AD7707BR

• Peak Reflow Compatible (260 C): No
• No. Of Bits: 16 Bit
• Leaded Process Compatible: No
• Mounting Type: Surface Mount
• Features: 3V/5V, 1mW, 2?Channel, 16?Bit
• Package / Case: 20-SOIC
• Rohs Status: RoHS non-compliant
• Number Of Bits: 16
• Sampling Rate (per Second): 500
• Data Interface: DSP, MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 1mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

AD7707
OUTPUT NOISE
OUTPUT NOISE FOR LOW LEVEL INPUT
CHANNELS (5 V OPERATION)
Table 7 shows the AD7707 output rms noise and peak-to-peak
resolution in unbuffered mode for the selectable notch and
−3 dB frequencies for the part, as selected by FS0, FS1, and FS2
of the clock register. The numbers given are for the bipolar
input ranges with a V
numbers are typical and are generated at an analog input voltage of
0 V. Table 8 shows the rms noise and peak-to-peak resolution
when operating in buffered mode. It is important to note that
the peak-to-peak numbers represent the resolution for which
there is no code flicker. They are not calculated based on rms
noise but on peak-to-peak noise. The numbers given are for
bipolar input ranges with a V
Table 7. Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ 5 V AIN1 and AIN2 Unbuffered Mode Only
Filter First Notch
and Output Data
Rate
MCLK IN = 2.4576 MHz
10 Hz
50 Hz
60 Hz
250 Hz
500 Hz
MCLK IN = 1 MHz
4.05 Hz
20 Hz
25 Hz
100 Hz
200 Hz
Table 8. Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ 5 V AIN1 and AIN2 Buffered Mode Only
Filter First Notch
and Output Data
Rate
MCLK IN = 2.4576 MHz
10 Hz
50 Hz
60 Hz
250 Hz
500 Hz
MCLK IN = 1 MHz
4.05 Hz
20 Hz
25 Hz
100 Hz
200 Hz
−3 dB
Frequency
2.62 Hz
13.1 Hz
15.72 Hz
65.5 Hz
131 Hz
1.06 Hz
5.24 Hz
6.55 Hz
26.2 Hz
52.5 Hz
−3 dB
Frequency
2.62 Hz
13.1 Hz
15.72 Hz
65.5 Hz
131 Hz
1.06 Hz
5.24 Hz
6.55 Hz
26.2 Hz
52.4 Hz
REF
of 2.5 V and AV
REF
of 2.5 V. These numbers are
Gain of 1
1.2 (16)
3.6 (16)
4.7 (16)
95 (13)
600 (10.5)
1.19 (16)
3.68 (16)
4.78 (16)
100 (13)
543 (10.5)
Gain of 1
1.47 (16)
4.2 (16)
4.9 (16)
104 (13)
572 (10.5)
1.48 (16)
3.9 (16)
5.37 (16)
98.9 (13)
596 (10.5)
DD
= 5 V. These
Gain of 2
0.7 (16)
2.1 (16)
2.6 (16)
65 (13)
316 (10.5)
0.69 (16)
2.18 (16)
2.66 (16)
50.1 (13)
318 (10.5)
0.95 (16)
2.6 (16)
3 (16)
293 (10.5)
8.95 (16)
2.46 (16)
3.05 (16)
298 (10.5)
Gain of 2
52 (13)
52.4 (13)
Typical Output RMS Noise in μV (Peak-to-Peak Resolution in Bits)
Typical Output RMS oise in μV (Peak-to-Peak Resolution in Bits)
Gain of 4
0.7 (16)
1.25 (16)
1.5 (16)
23.4 (13)
138 (10.5)
0.71 (16)
1.19 (16)
1.51 (16)
23.5 (13)
132 (10.5)
Gain of 4
0.88 (16)
1.6 (16)
1.8 (16)
26 (13)
125 (10.5)
0.87 (16)
1.77 (16)
1.89 (16)
26.1 (13)
133 (10.5)
Rev. B | Page 14 of 52
Gain of 8
0.54 (16)
0.89 (16)
0.94 (16)
11.6 (13)
71 (10.5)
0.63 (16)
0.94 (16)
1.07 (16)
11.9 (13)
68.1 (10.5)
1.1 (16)
Gain of 8
0.55 (16)
1 (16)
14 (13)
69 (10.5)
0.67 (16)
1.19 (16)
1.33 (16)
12.7 (13)
69.3 (10.5)
typical and are rounded to the nearest LSB. The numbers apply
for the CLKDIV bit of the clock register set to 0. The output
noise comes from two sources. The first is the electrical noise in
the semiconductor devices (device noise) used in the
implementation of the modulator. Secondly, when the analog
input is converted into the digital domain, quantization noise is
added. The device noise is at a low level and is independent of
frequency. The quantization noise starts at an even lower level
but rises rapidly with increasing frequency to become the
dominant noise source. The numbers in Table 7 and Table 8 are
given for the bipolar input ranges. For the unipolar ranges, the
rms noise numbers are the same as the bipolar range but the
peak-to-peak resolution is now based on half the signal range,
which effectively means losing one bit of resolution.
Gain of 16
0.28 (16)
0.62 (16)
0.73 (16)
6.5 (13)
38 (10.5)
0.27 (16)
0.6 (16)
0.7 (16)
5.83 (13)
33.1 (10.5)
Gain of 16
0.42 (16)
0.89 (15.5)
1 (15.5)
6.5 (13)
40 (10.5)
0.41 (16)
0.94 (16)
1.11 (15.5)
6.08 (13)
34.7 (10.5)
Gain of 32
0.28 (16)
0.60 (15.5)
0.68 (15.5)
3.4 (13)
18 (10.5)
0.27 (16)
0.6 (15.5)
0.67 (15.5)
3.64 (13)
17.6 (10.5)
Gain of 32
0.42 (16)
0.94 (15)
1 (14.5)
4.1 (12.5)
19 (10.5)
0.40 (16)
0.93 (15)
1.06 (14.5)
4.01 (12.5)
16.9 (10.5)
Gain of 64
0.28 (15.5)
0.56 (14.5)
0.66 (14.5)
2.1 (12.5)
10 (10)
0.26 (15.5)
0.56 (14.5)
0.66 (14.5)
2.16 (12.5)
9.26 (10.5)
0.42 (15)
0.9 (14)
0.94 (14)
2.7 (12.5)
10 (10.5)
0.40 (15)
0.95 (14)
1.04 (13.5)
2.62 (12.5)
9.67 (10.5)
Gain of 64
Gain of 128
0.27 (14.5)
0.56 (13.5)
0.63 (13.5)
1.5 (12)
5.7 (10)
0.24 (15)
0.56 (13.5)
0.65 (13.5)
1.5 (12)
6.13 (10)
Gain of 128
0.41 (14)
0.9 (13)
0.94 (13)
2.3 (11.5)
5.9 (10)
0.40 (14)
0.9 (13)
1.02 (12.5)
2.33 (11.5)
6.34 (10)