AFE5808ZCF datasheet(6/68 Pages) TI1

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8CH_SNR

1CH_SNR

N + N

AFE5808

SLOS688C – SEPTEMBER 2010 – REVISED APRIL 2012

www.ti.com

ELECTRICAL CHARACTERISTICS

AVDD_5V = 5V, AVDD = 3.3V, AVDD_ADC = 1.8V, DVDD = 1.8V, AC-coupled with 0.1µF at INP and bypassed to ground

with 15nF at INM, No active termination, VCNTL= 0V, fIN= 5MHz, LNA = 18dB, PGA = 24dB, 14Bit, sample rate = 65MSPS,

LPF Filter = 15MHz, low noise mode, VOUT = –1dBFS, internal 500Ω CW feedback resistor, CMOS CW clocks, ADC

configured in internal reference mode, Single-ended VCNTL mode, VCNTLM = GND, at ambient temperature TA = 25°C,

unless otherwise noted. Min and max values are specified across full-temperature range with AVDD_5V = 5V, AVDD = 3.3V,

AVDD_ADC = 1.8V, DVDD = 1.8V

PARAMETER

TEST CONDITION

MIN

TYP

MAX

UNITS

TGC FULL SIGNAL CHANNEL (LNA+VCAT+LPF+ADC)

Rs = 0

Ω, f = 2MHz, LNA = 24/18/12dB, PGA = 24dB

0.76/0.83/1.16

Input voltage noise over LNA Gain(low

nV/rtHz

noise mode)

Rs = 0

Ω, f = 2MHz,LNA = 24/18/12dB, PGA = 30dB

0.75/0.86/1.12

Rs = 0

Ω, f = 2MHz,LNA = 24/18/12dB, PGA = 24dB

1.1/1.2/1.45

Input voltage noise over LNA Gain(low

en (RTI)

nV/rtHz

power mode)

Rs = 0

Ω, f = 2MHz, LNA = 24/18/12dB, PGA = 30dB

1.1/1.2/1.45

Rs = 0

Ω, f = 2MHz,LNA = 24/18/12dB, PGA = 24dB

1/1.05/1.25

Input Voltage Noise over LNA

nV/rtHz

Gain(Medium Power Mode)

Rs = 0

Ω, f = 2MHz, LNA = 24/18/12dB, PGA = 30dB

0.95/1.0/1.2

Input referred current noise

2.7

pA/rtHz

Rs = 200

Ω, 200Ω active termination, PGA = 24dB, LNA = 12/18/24dB

3.85/2.4/1.8

Noise figure

Rs = 100

Ω, 100Ω active termination, PGA = 24dB, LNA = 12/18/24dB

5.3/3.1/2.3

VMAX

Maximum Linear Input Voltage

LNA gain = 24/18/12dB

250/500/1000

mVpp

VCLAMP

Clamp Voltage

Reg52[10:9] = 0, LNA = 24/18/12dB

350/600/1150

Low noise mode

24/30

PGA Gain

Medium/Low power mode

24/28.5

LNA = 24dB, PGA = 30dB, Low noise mode

Total gain

LNA = 24dB, PGA = 30dB, Med power mode

52.5

LNA = 24dB, PGA = 30dB, Low power mode

52.5

Ch-CH Noise Correlation Factor without

Summing of 8 channels

Signal

(1)

Full band (VCNTL = 0/0.8)

0.15/0.17

Ch-CH Noise Correlation Factor with

Signal

(1)

1MHz band over carrier (VCNTL= 0/0.8)

0.18/0.75

VCNTL= 0.6V(22 dB total channel gain)

Signal to Noise Ratio (SNR)

VCNTL= 0, LNA = 18dB, PGA = 24dB

59.3

dBFS

VCNTL = 0, LNA = 24dB, PGA = 24dB

Narrow Band SNR

SNR over 2MHz band around carrier at VCNTL=0.6V ( 22dB total gain)

dBFS

Input Common-mode Voltage

At INP and INM pins

2.4

Input resistance

Preset active termination enabled

50/100/200/400

Input capacitance

Input Control Voltage

VCNTLP-VCNTLM

1.5

Common-mode voltage

VCNTLP and VCNTLM

0.75

Gain Range

-40

Gain Slope

VCNTL= 0.1V to 1.1V

dB/V

Input Resistance

Between VCNTLP and VCNTLM

200

Input Capacitance

Between VCNTLP and VCNTLM

TGC Response Time

VCNTL= 0V to 1.5V step function

1.5

µs

3rd order-Low-pass Filter

10, 15, 20, 30

MHz

Settling time for change in LNA gain

µs

Settling time for change in active

µs

termination setting

(1)

Noise correlation factor is defined as Nc/(Nu+Nc), where Nc is the correlated noise power in single channel; and Nu is the uncorrelated

noise power in single channel. Its measurement follows the below equation, in which the SNR of single channel signal and the SNR of

summed eight channel signal are measured.

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