AD8285 Datasheet, PDF (3/27 Pages) Analog Devices – Radar Receive Path AFE - 4-Channel LNA/PGA/AAF with ADC

Data Sheet
AD8285
SPECIFICATIONS
AC SPECIFICATIONS
AVDD18 = AVDD18ADC = 1.8 V, AVDD33 = AVDD33x¹ = AVDD33REF = 3.3 V, DVDD18 = DVDD18CLK = 1.8 V, DVDD33SPI =
DVDD33CLK = DVDD33DRV = 3.3 V, 1.024 V internal ADC reference, fIN = 2.5 MHz, fSAMPLE = 72 MSPS, RS = 50 Ω, LNA + PGA gain =
34 dB, LPF cutoff = fSAMPLECH/4, full channel mode, 12-bit operation, temperature = −40°C to +105°C, unless otherwise noted.
Table 2.
Parameter²
ANALOG CHANNEL CHARACTERISTICS
Gain
Gain Range
Gain Error
Input Voltage Range
Input Resistance
Input Capacitance
Input Referred Voltage Noise
Noise Figure
Output Offset
AAF Low-Pass Filter Cutoff
Tolerance
AAF Attenuation in Stop Band
Group Delay Variation
Channel-to-Channel Phase Variation
Channel-to-Channel Gain Matching
1 dB Compression
Crosstalk
POWER SUPPLY
AVDD18, AVDD18ADC
AVDD33, AVDD33x¹, AVDD33REF
DVDD18, DVDD18CLK
DVDD33SPI, DVDD33CLK,
DVDD33DRV
IAVDD18
IAVDD33
IDVDD18
IDVDD33
Total Power Dissipation Per Channel
Power-Down Dissipation
Power Supply Rejection Ratio (PSRR)
Test Conditions/Comments
LNA, PGA, and AAF channels
Channel gain = 16 dB
Channel gain = 22 dB
Channel gain = 28 dB
Channel gain = 34 dB
200 Ω input impedance selected
200 kΩ input impedance selected
Maximum gain at 1 MHz
Minimum gain at 1 MHz
Maximum gain, RS = 50 Ω, unterminated
Maximum gain, RS = RIN = 50 Ω
Gain = 16 dB
Gain = 34 dB
−3 dB, programmable
After filter autotune
Third-order elliptic filter
2× cutoff
3× cutoff
Filter set at 2 MHz
Frequencies up to −3 dB
¼ of −3 dB frequency
Frequencies up to −3 dB
¼ of −3 dB frequency
Relative to output
Full channel mode
Full channel mode
Full channel mode, no signal, typical supply
voltage × maximum supply current; excludes
output current
Min
−1.25
0.180
160
−60
−250
−10
−5
−1
−0.5
−0.25
1.7
3.1
1.7
3.1
Typ
Max Unit
16/22/28/34
18
0.25
0.125
0.0625
0.03125
0.230
200
22
1.85
6.03
7.1
12.7
1.0 to 12.0
±5
+1.25
0.280
240
+60
+250
+10
dB
dB
dB
V p-p
V p-p
V p-p
V p-p
kΩ
kΩ
pF
nV/√Hz
nV/√Hz
dB
dB
LSB
LSB
MHz
%
30
dB
40
dB
400
ns
±0.5
+5
Degrees
+1
Degrees
±0.1
+0.5 dB
+0.25 dB
9.8
dBm
−70
−55 dBc
1.8
1.9
V
3.3
3.5
V
1.8
1.9
V
3.3
3.5
V
130 mA
130 mA
22
mA
2
mA
185 mW
5
mW
1.6
mV/V
Rev. B | Page 3 of 27