TNETEL1400

EtherLoop

™ TRANSCEIVER

SPHS004A – FEBRUARY 1999 – REVISED MARCH 1999

8

POST OFFICE BOX 655303

electrical characteristics over recommended operating conditions

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

ICC

Supply current

Normal operation

25

50

µA

ICC

Supply current

Power-down mode

1.5

3

µA

VREF

4-V reference voltage

3.88

4

4.12

V

VANG

2.5-V reference voltage

2.38

2.5

2.62

V

IREFP

4-V reference current

Source

1

mA

IANG

2.5-V reference current

Source/sink

100

mA

† All typical values are at VCC = 5 V, TA = 25°C (unless otherwise noted).

transmitter (see Figure 5)

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

TX maximum output level

VCC = 5 V, RL = 110 Ω,

RX_TERM = 0, TX_EN = 1,

V(TXINP) = 1.2 VPP sinusoid at f = 500 kHz

(see Note 1)

TXGAIN = 0000,

RXGAIN = 0XX

21

22

23

dBm

TXGAIN = 0001

–3.3

–3

–2.7

TXGAIN = 0010

–6.3

–6

–5.7

TXGAIN = 0011

–9.3

–9

–8.7

TX attentuator accuracy

VCC = 5 V, RL = 110 Ω,

TXGAIN = 0100

–12.3

–12

–11.7

TX attentuator accuracy

(relative to maximum output)

RX_TERM = 0, TX_EN = 1, RXGAIN = 0XX,

V(TXINP) =1 2VPP sinusoid at f = 500 kHz

TXGAIN = 0101

–15.3

–15

–14.7

dB

()

TX attentuator accuracy

( l ti

t

i

t

t)

V(TXINP) = 1.2 VPP sinusoid at f = 500 kHz

[output is measured at IN_INT and IP_INT

TXGAIN = 0110

–18.3

–18

–17.7

dB

(relative to maximum output)

[out ut is measured at IN_INT and IP_INT

(ac coupled)]

TXGAIN = 0111

–21.3

–21

–20.7

TXGAIN = 1000

–24.3

–24

–23.7

TXGAIN = 1001

–27.3

–27

–26.7

TXGAIN = 1010

–30.3

–30

–29.7

TX output level variation

over frequency

30 kHz < f < 2.5 MHz

monotonically decreasing for f > 3 MHz,

RL = 110 Ω, RX_TERM = 0, TX_EN = 1,

V(TXINP) = 1.2 VPP sinusoid at f = 500 kHz

with transformer connected as in Figure 1

(see Note 1)

TXGAIN = 0000,

RXGAIN = 0XX

1

dB

TX output

distortion

Odd harmonics

VCC = 5 V, RL = 110 Ω,

RX_TERM = 0, TX_EN = 1,

TXGAIN = 0000,

–35

dBc

(all gain

settings)

Even harmonics

_

,

_

,

V(TXINP) = 1.2 VPP sinusoid at f = 500 kHz

(see Note 1)

,

RXGAIN = 0XX

–50

dBc

TX output

signal-to-noise ratio (SNR)

(all gain settings)

VCC = 5 V, RL = 110 Ω,

RX_TERM = 0, TX_EN = 1,

V(TXINP) = 1.2 VPP sinusoid at f = 500 kHz

(see Note 1)

TXGAIN = 0000,

RXGAIN = 0XX

50

dB

TX maximum

output-level variation with VCC

VCC = 5 V ± 0.25 V, RL = 110 Ω,

RX_TERM = 0, TX_EN = 1,

V(TXINP) = 1.2 VPP sinusoid at f = 500 kHz

(see Note 1)

TXGAIN = 0000,

RXGAIN = 0XX

1

dB/V

Zin(TXIN)

TX

input impedance

TXGAIN = 0000, RXGAIN = 0XX (see Note 1)

1400

TYP+

30%

Ω

TX input impedance variation

as percent of Zin(TXIN)

TXGAIN = 0000, RXGAIN = 0XX

–30%

30%

† All typical values are at VCC = 5 V, TA = 25°C (unless otherwise noted).

NOTE 1: While the RX circuit is disabled during transmission, it is still connected and, therefore, must withstand the signal levels placed at its

input terminals.