TDA8780M Datasheet, PDF (6/16 Pages) NXP Semiconductors – True logarithmic amplifier

Philips Semiconductors
True logarithmic amplifier
Product specification
TDA8780M
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
PARAMETER
V_P
V_i
T_amb
T_stg
supply voltage
input voltage all other pins referenced to ground
operating ambient temperature
IC storage temperature
MIN.
−0.3
−0.3
−20
−55
MAX.
+6.0
V_P + 0.3
+75
+150
UNIT
V
V
°C
°C
HANDLING
Inputs and outputs are protected against electrostatic discharge in normal handling. However, to be totally safe, it is
desirable to take normal precautions appropriate to handling MOS devices.
ESD in accordance with “MIL STD 883C” - “Method 3015”.
CHARACTERISTICS
V_P = 5 V; T_amb = 25 °C; V_ref = 2.5 V; V_in at f_in = 10.7 MHz; R_g = 3.3 kΩ; output not loaded; unless otherwise specified.
Signal values expressed as peak voltages mV (peak), µV (peak) or dBm (50 Ω).
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
Supply
V_P
supply voltage
4.5
I_P
supply current
V_P = 5.5 V; V_in = 1 V
−
V_P = 5.0 V; V_in = 1 V
−
I_P(PD)
supply current in power-down
output not loaded
−
R_L = 10 kΩ
−
t_sw
switching time
see Fig.6
−
Reference input (pin 8)
V_ref
external reference voltage input
2.0
R_ref
external reference resistance input
−
Inputs (pins 1 and 20)
f_in
input operating frequency
note 1
1.0
R_diff
differential small-signal input
V_in = 10 mV
−
resistance
C_diff
differential input capacitance
−
V_in(min) input voltage level at start of
−
logarithmic characteristic
V_in(top) input voltage level at top end of
−
logarithmic characteristic
V_in(max) maximum input signal voltage
input protection diodes not
−
conducting
∆V_in
input voltage level spread across over whole T_amb and V_P range −
logarithmic range
5.0
5.5
V
5.4
6.7
mA
4.9
6.2
mA
40
200
µA
100 250
µA
70
−
µs
2.5
V_P − 2.0 V
40
−
kΩ
10.7 15
10
−
2
−
60
−
300 −
1
−
±2.5 −
MHz
kΩ
pF
µV
mV
V
dB
1995 Jul 25
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