U2731B Datasheet, PDF (16/25 Pages) ATMEL Corporation – DAB ONE- CHIP FRONT END

Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): V_S = 8.5 V, T_amb = 25°C
No. Parameters
Test Conditions
Pin
Symbol
Min. Typ. Max. Unit Type*
AGC threshold (th2)
2.10
(internal AGC)
upper limit (TBi = 1111)
Controlled by two-wire bus bits TBi;
P_IN,MAX = -25 dBm
16
V_{int AGC,RF}
5.1
V
B
lower limit (TBi = 0000)
1.0 1.5 1.8
V
A
2.11 Output impedance
Single ended; f(SAW1) = 39 MHz 18 (19) Z_out,SAW
30
Ω
3 VCO
3.1 Phase noise
∆f = 10 kHz
L(f)
-88
dBc/Hz D
3.2 Phase noise
4 IF Part
f_LO
100
400 MHz
D
4.1 Voltage gain
4.2 Voltage gain
IFIN2 blocked
(see Figure 9 on page 21)
f_LO,IFMIX = f_ref or
F_LO,IFMIX = 2 × f_ref
IFIN2 blocked
(see Figure 9 on page 21)
IF mixer switched off
24 →29
G_V,tot
42 44
48
dB
A
24 →29
G_V,tot
45 47
51
dB
A
4.3 AGC range IF
42 44
48
dB
A
4.4
Noise figure
(double side band)
IFIN2 blocked
24 →29
NF_DSB
11
dB
D
IFIN2 blocked, 3rd order
4.5
Maximum input power
level
intermodulation distance ≥ 40 dBc;
RL(IFOUT) = 1 k; TCi = 0000;
24
P_in,max
-20
dBm
C
R₁₀ = 4.7 k, R₁₁ = 1.8 k
4.6 Input frequency range
23, 24
f_in,IFIN
10
60 MHz
D
4.7 Input impedance
IFIN2 blocked, f_IF,IFIN = 38.912 MHz 23, 24
Z_in,IFIN
600 -
j1000
Ω
D
4.8 Output frequency range Single ended
4.9 Output impedance
5 RF AGC Unit
Single ended
f_out,IFO (3 MHz)
f_out,IFO (20 MHz)
f_out,IFO (38.9 MHz)
29
f_out,IFO
1
45 MHz
D
29
Z_out,IFOUT
20 + j50
65 + j35
58 - j25
Ω
Ω
D
Ω
5.1
Positive charge pump
current, fast mode
V_WAGC = LOW
V_SLI = HIGH
5.2
Negative charge pump
current, fast mode
V_WAGC = LOW
V_SLI = HIGH
5.3
Positive charge pump
current, slow mode
V_WAGC = LOW
V_SLI = LOW
5.4
Negative charge pump
current, fast mode
V_WAGC = LOW
V_SLI = LOW
5.5
Minimum gain control
voltage
16 ICPRF_POS,FM 145 180
220
µA
A
16 ICPRF_NEG,FM -220 -180 -145 µA
A
16 ICPRF_POS,SM 30
40
52
µA
A
16
ICPRF_NEG,FM -52
-40
-30
µA
A
VAGC_min
0.75
V
C
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Note: 1. The phase detector’s phase-noise contribution to the VCO’s frequency spectrum is determined by the operating frequency
of the phase detector divided by 4 according to the fractional-N technique (regularly: 16 kHz).
16 U2731B
4671C–DAB–06/04