AD9874 Analog Devices, AD9874 Datasheet - Page 12

• Manufacturer Part Number: AD9874
• Description: Low Power IF Digitizing Subsystem
• Manufacturer: Analog Devices

Specifications of AD9874

• Resolution (bits): 24bit
• # Chan: 1
• Sample Rate: 26MSPS
• Interface: Ser
• Analog Input Type: Diff-Uni,SE-Uni
• Adc Architecture: Sigma-Delta
• Pkg Type: QFP

AD9874
(VDDI = VDDF = VDDA = VDDC = VDDL = VDDD = VDDH = VDDx, VDDQ = VDDP = 5.0 V, f
T
TPC 13a. Noise Figure vs. Frequency
(Minimum Attenuation, f
BW = 10 kHz, High Bias)
TPC 14a. Noise Figure vs. Frequency
(Minimum Attenuation, f
BW = 24 kHz, High Bias)
1
2
3
Data taken with Toko FSLM series 10 µH inductors.
High Bias corresponds to LNA_Mixer Setting of 33 in SPI Register 0x01.
Low Bias corresponds to LNA_Mixer Setting of 12 in SPI Register 0x01.
A
TPC 15a. Noise Figure vs. Interferer
Level (16-Bit Data, BW = 12.5 kHz,
AGCR = 1, f
= 25 C, LO = –5 dBm, LO and CLK Synthesizer Disabled, 16-Bit Data with AGC and DVGA enabled, unless otherwise noted.)
20.0
18.5
17.0
15.5
14.0
12.5
11.0
9.5
8.0
13
12
11
10
13
12
11
10
–55
9
8
7
6
9
8
7
6
0
0
16-BIT w/DVGA
–50
50
50
NOISE FIGURE
–45
100 150 200 250 300 350 400 450
100 150 200 250 300 350 400 450
INTERFERER LEVEL – dBm
INTERFERER
–40
FREQUENCY – MHz
FREQUENCY – MHz
24-BIT
–35
16-BIT w/DVGA
AGC
–30
–25
= f
CLK
CLK
IF
–20
= 18 MSPS,
= 26 MSPS,
+ 110 kHz)
–15
24-BIT
–10
500
500
–5
112
96
48
16
128
80
64
32
0
TPC 13b. Noise Figure vs. Frequency
(Minimum Attenuation, f
BW = 10 kHz, Low Bias)
TPC 14b. Noise Figure vs. Frequency
(Minimum Attenuation, f
BW = 24 kHz, Low Bias)
TPC 15b. Noise Figure vs. Interferer
Level (16-Bit Data with DVGA, BW =
12.5 kHz, AGCR = 1, f
f
IF
13
12
11
10
13
12
11
10
+ 110 kHz)
16
15
14
13
12
11
10
9
8
7
6
9
8
7
6
–50
9
8
0
0
50
50
–45
100 150 200 250 300 350 400 450
100 150 200 250 300 350 400 450
INTERFERER LEVEL – dBm
–40
FREQUENCY – MHz
FREQUENCY – MHz
–35
–12–
AGC ATTN
24-BIT
16-BIT w/DVGA
–30
INTERFERER
CLK
CLK
–25
16-BIT w/DVGA
NOISE FIGURE
= 18 MSPS,
= 26 MSPS,
24-BIT
–20
CLK
–15
= 18 MSPS, f
=
500
500
–10
256
224
192
160
128
96
64
32
0
IF
= 109.56 MHz, f
TPC 15c. Noise Figure vs. Interferer
Level (24-Bit Data, BW = 12.5 kHz,
AGCR = 1, f
–10
–10
TPC 13c. Input IP3 vs. Frequency
(f
TPC 14c. Input IP3 vs. Frequency
(f
–2
–4
–6
–8
–2
–4
–6
–8
16
15
14
13
12
11
10
4
2
0
2
0
9
8
–65
CLK
CLK
0
0
50
50
= 18 MSPS)
= 26 MSPS)
HIGH BIAS
LOW BIAS
–55
100 150 200 250 300 350 400 450
100 150 200 250 300 350 400 450
INTERFERER LEVEL – dBm
NOISE FIGURE
INTERFERER
FREQUENCY – MHz
LO
FREQUENCY – MHz
–45
= 107.4 MHz,
1
AGC ATTN
–35
= f
HIGH BIAS
LOW BIAS
–25
IF
+ 110 kHz)
–15
REV. A
500
500
–5
128
96
64
32
0