U4055B Datasheet, PDF (4/10 Pages) TEMIC Semiconductors – Low-Voltage Electronic Speech Circuit with Dialer Interface

U4055B/U4055B1
Electrical Characteristics
Reference point Pin 3, cable equivalent = I = 1 km, ∅ 0.5 mm, R’ = 184 Ω, C’ = 37 nF, f = 1300 Hz, 0 dBm = 775 mV_rms,
R_DC = 56 Ω / 2 W, T_amb = 25°C, unless otherwise specified.
Parameters
Test Conditions / Pins
Symbol Min. Typ. Max. Unit
Line voltage
I_L = 8 mA
I_L = 20 mA
I_L = 30 mA
I_L = 73 mA,
see figure 4
V_L
1.8
2.1
2.6
V
3.0
3.3
3.6
V
3.6
4.5
V
7.7
9.7
V
Transmit and sidetone
see figure 5
Input resistance
Gain
Pin 7 - 8
R_i
7
10
13
kΩ
I_L = 30 mA = l = 5 km
adjustable with R_AGC
D^GGss
57
–7
59
61
dB
–9
dB
I_L = 30 to 73 mA ≅ l = 5 km to
0 km
Noise at line weighted
psophometrically
Sidetone reduction
DTMF-Amplifier
I_L = 73 mA ≅ l = 0 km
y^{VMIC = 0 V}
I_L 20 mA
see figure 6
n_o
G_STA
10
–70
–68 dBm
15
20
dB
Input resistance
DTMF Gain
y Volume range d 5%
Receiving amplifier
Pin 8 - 3
R_D
8
10
13
kΩ
I_L = 30 mA ≅ I = 5 km
R_ex1 = 0 adjustable with R_ex1
D^GGDD
9
–7
13
dB
–9
dB
I_L = 31 mA to 78 mA = l =
5 km to 0 km
see figure 4
V₀
1
V_RMS
Input resistance
Gain
Pin 12 - 3
R_i
50
kΩ
R_HH = 300 Ω, I_L = 30 mA ≅ l = G_R
–1
–3
–5
dB
5 km
R_HH = 300 Ω adjustable with
DG_R
–5
–6
–7
dB
R_AGC,
I_L = 31 mA to 78 mA
l = 5 km to 0 km
Receiving noise at earphone
weighted psophometrially
Gain change when muted
Output saturation threshold
MUTE or MUTE-input
I_L = 78 mA = l = 0 km
S2 = 0
y I_L 20 mA
y I_L 20 mA
n_i
–80
–71 dBm
G_RM
15
20
24
dB
V₀
0.8
1
1.5
V_pp
MUTE-input current
Pin 9 = 0 V
I_M
20
50
80
µA
MUTE off input voltage
V_Moff
1.5
V
MUTE on input voltage
V_{M on}
0.3
V
MUTE-input current
Pin 9 = 1.5 V
I_M
10
20
30
µA
MUTE off input voltage
V_{M off}
0.3
V
MUTE on input voltage
V_{M on}
1.5
V
Supply voltage
y ^{see figure 4}
I_L 20 mA MUTE or MUTE
V+
3
6.1
V
Output voltage
switched off
switched on
2.5
2.9
3.1
V
Output current
y ^{Pin 10}
I_L 20 mA MUTE or MUTE
I+
switched off
switched on
1
30
µA
mA
Pin 10
4 (10)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. A1, 06-May-96