Electronic Components Datasheet Search |
|
AD7707 Datasheet(PDF) 16 Page - Analog Devices |
|
|
AD7707 Datasheet(HTML) 16 Page - Analog Devices |
16 / 53 page AD7707 Rev. B | Page 15 of 52 OUTPUT NOISE FOR LOW LEVEL INPUT CHANNELS (3 V OPERATION) Table 9 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 VREF of 1.225 V and an AVDD = 3 V. These numbers are typical and are generated at an analog input voltage of 0 V. Table 10 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 VREF of 1.225 V and for either buffered or unbuffered mode. These numbers are 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 implementa- tion 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 fre- quency. 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 9 and Table 10 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 1 bit of resolution. Table 9. Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ 3 V AIN1 and AIN2 Unbuffered Mode Only Filter First Notch and Output Data Rate −3 dB Frequency Typical Output RMS Noise in μV (Peak-to-Peak Resolution in Bits) Gain of 1 Gain of 2 Gain of 4 Gain of 8 Gain of 16 Gain of 32 Gain of 64 Gain of 128 MCLK IN = 2.4576 MHz 10 Hz 2.62 Hz 1.60 (16) 0.8 (16) 0.48 (16) 0.29 (16) 0.29 (16) 0.27 (15.5) 0.26 (14.5) 0.26 (13.5) 50 Hz 13.1 Hz 3.8 (16) 1.9 (16) 1.1 (16) 0.64 (16) 0.60 (15.5) 0.6 (14.5) 0.6 (13.5) 0.6 (12.5) 60 Hz 15.72 Hz 4.4 (16) 2.2 (16) 1.35 (16) 0.78 (16) 0.7 (15) 0.68 (14.5) 0.64 (13.5) 0.64 (12.5) 250 Hz 65.5 Hz 53 (13) 24 (13) 15 (13) 6.8 (13) 3.6 (12.5) 2.1 (12.5) 1.5 (12) 1.3 (11) 500 Hz 131 Hz 300 (10.5) 138 (10.5) 80 (10.5) 34 (10.5) 18 (10.5) 8.7 (10.5) 4.8 (10) 3.4 (10) MCLK IN = 1 MHz 4.05 Hz 1.06 Hz 1.56 (16) 0.88 (16) 0.52 (16) 0.3 (16) 0.28 (16) 0.27 (15.5) 0.27 (14.5) 0.26 (13.5) 20 Hz 5.24 Hz 3.85 (16) 2.02 (16) 1.15 (16) 0.74 (16) 0.63 (15.5) 0.57 (14.5) 0.61 (13.5) 0.58 (12.5) 25 Hz 6.55 Hz 4.56 (16) 2.4 (16) 1.4 (16) 0.79 (16) 0.68 (15) 0.66 (14.5) 0.64 (13.5) 0.64 (12.5) 100 Hz 26.2 Hz 45.7 (13) 22 (13) 13.7 (13) 5.27 (13) 2.64 (13) 2 (12.5) 1.59 (12) 1.4 (11) 200 Hz 52.4 Hz 262 (10.5) 125 (10.5) 66 (10.5) 32.4 (10.5) 18.4 (10.5) 8.6 (10.5) 4.64 (10.5) 3.3 (10) Table 10. Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ 3 V AIN1 and AIN2 Buffered Mode Only Filter First Notch and Output Data Rate −3 dB Frequency Typical Output RMS Noise in μV (Peak-to-Peak Resolution in Bits) Gain of 1 Gain of 2 Gain of 4 Gain of 8 Gain of 16 Gain of 32 Gain of 64 Gain of 128 MCLK IN = 2.4576 MHz 10 Hz 2.62 Hz 1.80 (16) 1 (16) 0.7 (16) 0.41 (16) 0.41 (16) 0.41 (15) 0.41 (14) 0.41 (13) 50 Hz 13.1 Hz 4.1 (16) 2.4 (16) 1.5 (16) 1 (15.5) 0.91 (15) 0.89 (14) 0.86 (13) 0.83 (12) 60 Hz 15.72 Hz 5.1 (16) 3 (16) 1.8 (16) 1.1 (15.5) 0.94 (14.5) 0.94 (13.5) 0.99 (13) 0.99 (11.5) 250 Hz 65.5 Hz 50 (13) 27 (13) 12.3 (13) 6.4 (13) 4 (12.5) 2.7 (12.5) 2.2 (11.5) 1.8 (11) 500 Hz 131 Hz 275 (10.5) 125 (10.5) 80 (10.5) 39 (10.5) 16 (10.5) 8.9 (10.5) 5.2 (10) 4.2 (9.5) MCLK IN = 1 MHz 4.05 Hz 1.06 Hz 1.75 (16) 1.18 (16) 0.67 (16) 0.44 (16) 0.41 (16) 0.44 (15) 0.43 (14) 0.43 (13) 20 Hz 5.24 Hz 4.21 (16) 2.5 (16) 1.48 (16) 1 (15.5) 0.94 (15) 0.96 (14) 0.89 (13) 0.86 (12) 25 Hz 6.55 Hz 5.15 (16) 2.8 (16) 1.8 (16) 1.15 (15.5) 1 (14.5) 1.02 (13.5) 0.96 (13) 1.03 (11.5) 100 Hz 26.2 Hz 46.1 (13) 24.3 (13) 13.6 (13) 6.71 (13) 4.1 (12.5) 2.54 (12.5) 2.3 (11.5) 2.15 (10.5) 200 Hz 52.4 Hz 282 (10.5) 123 (10.5) 66 (10.5) 35.3 (10.5) 14.8 (10.5) 9.91 (10.5) 5.48 (10) 4.01 (9.5) |
Similar Part No. - AD7707_17 |
|
Similar Description - AD7707_17 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |