AFE5816 Datasheet, PDF (12/162 Pages) Texas Instruments – 16-Channel Ultrasound AFE

AFE5816
SBAS688D – APRIL 2015 – REVISED NOVEMBER 2015
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Electrical Characteristics: TGC Mode (continued)
At T_A = 25°C, unless otherwise noted. Supply: AVDD_1P8 = 1.8 V, AVDD_1P9 = 1.9 V, AVDD_3P15 = 3.15 V, and
DVDD_1P2 = 1.2 V, DVDD_1P8 = 1.8 V. Input to the device: input signal is ac-coupled to INP with a 10-nF capacitor and is
applied with source resistance R_S = 50 Ω at frequency f_IN = 5 MHz, and a 50-MHz differential clock is applied on ADC_CLK.
Device settings: gain code = 319 (total gain = 45 dB), 14-bit ADC resolution, LVDS interface to capture ADC data, and
output amplitude V_OUT = –1 dBFS. Minimum and maximum values are specified across the full temperature range.
PARAMETER
TEST CONDITION
MIN TYP MAX UNIT
GENERAL (continued)
K_CORR
Channel-to-channel noise
correlation factor⁽³⁾
Without a signal, calculated in a 1-MHz
to 10-MHz bandwidth
With a signal, calculated in a 1-MHz to
10-MHz bandwidth
R_S = 330 Ω
R_S = 100 Ω
Total gain = 45 dB
Total gain = 26 dB
–20
–26
–17
–14
dB
With a signal, calculated in a 1-MHz Total gain = 45 dB
–13
bandwidth around a 5-MHz input signal
frequency
Total gain = 26 dB
–10
SNR
Signal-to-noise ratio
SNR calculated in 750 kHz to Nyquist ^{Total gain = 14 dB}
bandwidth
Total gain = 45 dB
65
68
55
58
dBFS
SNR_NB
Narrow-band SNR
SNR calculated in 2-MHz bandwidth
around input signal frequency
Total gain = 30 dB
72.5
76
dBFS
10
–3-dB cutoff frequency across
LPF
3rd-order, low-pass filter
LPF_PROG register settings;
see register 199
Low-noise and medium-
power mode
Low-power mode
15
20
25
MHz
5
7.5
10
12.5
Δ_LPF
Δ_Gr
LPF bandwidth variation
Channel-to-channel group
delay matching
2-MHz to 15-MHz input signal frequency
±5%
2
ns
Δ_φ
Channel-to-channel phase
matching
15-MHz signal
11
Degrees
G_MATCH
Gain matching
HD2
Second-order harmonic
distortion
Device-to-device, average across
channels
G_CODE < 64
G_CODE > 64
Channel-to-channel, same device
G_CODE < 64
G_CODE > 64
Output amplitude = –1 dBFS, gain = 45 dB
Output amplitude = –1 dBFS, gain = 6 dB
±0.5
–1 ±0.5
±0.5
–1 ±0.5
–65
–55
1
dB
1
dBc
HD3
Third-order harmonic
distortion
Output amplitude = –1 dBFS, gain = 45 dB
Output amplitude = –1 dBFS, gain = 6 dB
–60
dBc
–60
THD
Total harmonic distortion
Output amplitude = –1 dBFS, gain = 45 dB
Output amplitude = –1 dBFS, gain = 6 dB
–58
dBc
–54
IMD3
Third-order intermodulation Input frequency 1 = 5 MHz at –1 dBFS,
distortion
input frequency 2 = 5.01 MHz at –21 dBFS
–75
dBc
XTALK
Fundamental crosstalk
Signal applied to a single channel. Crosstalk measured on neighboring
channel.
–55
dBc
PN_1kHz
V_ORO
G_LNA
Phase noise
Output offset
LNA gain range in TGC
mode
Calculated at 1-kHz offset from 5-MHz input signal frequency
–129
±600
14 to 45
dBc/Hz
LSB
dB
(3) The noise-correlation factor is defined as 10 × log₁₀[Nc / (Nc + Nu)], where Nc is the correlated noise power in a single channel and Nu
is the uncorrelated noise power in a single channel. The noise-correlation factor measurement is described by the equation:
Nc
N _16Ch 1
(Nu Nc) (N_1Chu 240) 15
where N_16CH is the noise power of the summed 16 channels and N_1CH is the noise power of one channel.
12
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