U2750B-BFS_技术文档

U2750B-B

Tuner IC for DAB

Description

The U2750B-B is a monolithically integrated tuner

circuit

fabricated

with

Atmel

Wireless

&

Electrostatic sensitive device.

Microcontrollers’ advan-ced UHF5S technology.

Designed for applications in DAB receivers, it includes

two selectable mixers, one VCO, a SAW-filter driver, an

LO output buffer, a tristate band switch and an AGC-volt-

age generation block.

Observe precautions for handling.

F_De₈a_.5tu_Vr_se_us_{pply voltage}

D Balanced LO output for PLL

D RF frequency range 70 MHz to 260 MHz

D SAW-filter driver with low impedance output

D Two identical mixers, selectable by band-switch input

D Power measurement and generation of AGC voltage

by charge-pump output

D Balanced mixer input, balanced mixer output

(open collector)

D Three charge-pump currents selectable

(zero, low, high)

D High-impedance mixer inputs

D Four-pin voltage-controlled oscillator

D Voltage regulator for stable operating characteristics

Block Diagram

LO1 LO2 MXO1 MXO2 GND MAI1 MAI2 MBI1 MBI2

GND

VS

SWI1 SWI2

SLI

NWAGC

SAW

driver

BUF_LO

MIXA

MIXB

VCO

Voltage

stabilization

Band–

switch

C2 B1 B2 C1

GND

CP BDSW

GND

VS

TH SWO1 SWO2 NWAGC

12485

V_Tune

Figure 1. Block diagram

Rev. A2, 23-Feb-01

1 (10)

Preliminary Information

U2750B-B

Ordering Information

Extended Type Number

U2750B-BFS

Package

SSO28

Remarks

Pin Description

1

Symbol

CP

Function

Charge-pump output of the

comparator

Threshold input of the

comparator

LO1

CP

1

2

3

4

5

6

7

8

9

28

27

26

25

24

23

22

LO2

TH

BDSW

GND

2

TH

3

4, 5

6

7

8

BDSW Band-switch input

GND

MAI1

MAI2

MBI1

MBI2

GND

VS

GND

C1VC

B2VC

B1VC

C2VC

VS

Ground

Collector Pin 1 of VCO

Base Pin 2 of VCO

Base Pin 1 of VCO

Collector Pin 2 of VCO

Supply voltage

GND

9

11

10

12

C1VC

B2VC

B1VC

C2VC

GND

SWO1

Ground

Differential output of the

SAW driver

Differential output of the

SAW driver

13

SWO2

21

20

19

18

17

16

15

14

15

16

NWAGC AGC mode selection

SLI

SWI1

AGC mode selection

Differential input of the

SAW driver

Differential input of the

SAW driver

MXO2

MXO1

SWI2

SWI1

SLI

10

11

17

SWI2

VS

18

19

20

21

22

23

24

25

26

27

MXO1 Differential mixer output

MXO2 Differential mixer output

VS

GND

MBI2

MBI1

MAI2

MAI1

GND

LO2

SWO1

SWO2

NWAGC

12

13

14

Supply voltage

Ground

Differential input of mixer B

Differential input of mixer A

Ground

14815

Figure 2. Pinning

Differential output of LO

for PLL

28

LO1

Differential output of LO

for PLL

2 (10)

Rev. A2, 23-Feb-01

Preliminary Information

U2750B-B

Functional Description

The U2750B-B represents a tuner IC for applications in

DAB receivers. It is intended to be used for receiption of

band II or band III DAB signals and consists of two

mixers, one VCO, a SAW-filter driver, an LO output

buffer, a tristate band switch and an AGC-voltage

generation circuit as shown in figure 1.

AGC-Voltage Generation Block

The incoming RF signal which appears at the input Pins

MAI1, MAI2 or MBI1, MBI2 * depending on the

selection made by the Pin BDSW * is amplified, weakly

bandpass filtered (transition range: Y 50 MHz to

300 MHz), rectified and finally lowpass filtered.

The voltage derived in this ‘power measurement process’

is compared with a voltage threshold which is defined by

an external resistor connected to Pin TH, see figure 7.

Depending on the result of this comparison, a charge

pump feeds a positive or negative current to Pin CP in

order to charge or discharge an external capacitor. The

voltage of this external capacitor can be used to control

the gain of an external (pre-) amplifier stage. By means

of the Pins NWAGC and SLI, the current of the charge

pump can be selected according to the following table:

Mixers and VCO

In order to support two different channels, two identical

mixers are integrated. The RF signal is fed to these mixers

via the differential input Ports MAI1, MAI2 and MBI1,

MBI2. The band-switch input BDSW allows the selection

of one of these mixers or to switch off both.

An internal four-pin oscillator (Pins: B1VC, C1VC,

B2VC, C2VC) * an equivalent circuit is shown in

figure 9 * provides the LO signal to both mixers. Via an

LO buffer, the oscillators signal can be accessed at the

balanced output Pins LO1, LO2 in order to be fed to a

frequency synthesizer circuit (U2753B or U2733B). The

result of the mixing process of both mixers appears at the

differential open-collector output MXO1, MXO2. In the

application shown in figure 7, these mixer output pins are

loaded by a resonant load.

NWAGC

SLI

Charge-Pump Current

(m A)

LOW

HIGH

X

LOW

HIGH

off

45 m A (slow mode)

250 m A (fast mode)

An overview of the functionality of this block can be seen

in figure 8.

SAW-Filter Driver

The filters’ mixer output signal is applied to the

differential input Pins SWI1, SWI2 of a SAW-filter driver

which amplifies the result of the mixing process and feeds

it via its differential output Pins SWO1, SWO2 to an

external SAW filter.

Rev. A2, 23-Feb-01

3 (10)

Preliminary Information

U2750B-B

Absolute Maximum Ratings

Parameters

Supply voltage

Junction temperature

Storage temperature

External applied voltage at charge-pump output

Band-switch input voltage

NWAGC input voltage

Symbol

V

S

Min.

–0.3

Typ.

Max.

+9.5

125

+125

6.9

+6

Unit

V

°C

V

Pins 11 and 20

T

j

T

stg

–40

0.4

–0.3

Pin 1

Pin 3

Pin 14

Pin 15

V

CP

V

BDSW

V

NWAGC

SLI input voltage

V

SLI

Differential input voltage of SAW driver Pins 16 and 17

V

300

9.5

mV

rms

V

SWI

Mixer output supply voltage

Pins 18 and 19

V

MXO

6.5

Differential input voltage mixer A,B

V

MXI

50

mV

rms

Pins 22, 23, 24 and 25

Thermal Resistance

Parameters

Symbol

R

thJA

Value

130

Unit

K/W

Junction ambient

Operating Range

Parameters

Supply voltage

Ambient temperature

Symbol

Min.

8.0

–40

Typ.

8.5

Max.

9.35

+85

Unit

V

°C

Pins 11 and 20

V

S

T

amb

Electrical Characteristics

Test conditions (unless otherwise specified): V = 8.5 V, T

= +25°C (application circuit see figure 7)

S

amb

Parameters

Overall characteristics

Supply voltage

Supply current

Voltage gain

Test Conditions / Pins

Symbol

Min.

Typ.

Max.

Unit

Pins 11 and 20

V

S

8.0

21.6

30

8.5

27

32

8

9.35

32.4

34

V

I

mA

dB

S

1)

MXA, MXB IF/Port

G

V tot

1)

Noise figure

NF

DSB

(double side band)

Maximum input level

MXA, MXB

P

in,max

–25

–22

dBm

Third-order intermodulation

distance w 30 dBc

Mixer A, B

Mixer output current

Pins 18 and 19

I

2.6

70

3.3

4.0

mA

O,MX

Connected to V

S

Input frequency range

Input impedance

Pins 24, 25, 22 and 23

f

260

MHz

kΩ

pF

in,MX

Z

2.3 ||

0.9

in,MX

Single ended

4 (10)

Rev. A2, 23-Feb-01

Preliminary Information

U2750B-B

Electrical Characteristics (continued)

Test conditions (unless otherwise specified): V = 8.5 V, T

= +25°C, test circuit see figure 7

S

amb

Parameters

Test Conditions / Pins

Symbol

L(f)

Min.

Typ.

–92

Max.

300

Unit

VCO

Phase noise

Df = 10 kHz

dBc/Hz

MHz

Pins 27 and 28

200-W load, differential

f

110

26

LO

LO buffer

LO output power

P

LO

34

mV

rms

LO output impedance

SAW Driver

Differential, Pins 27 and 28

Z

200

W

out,LO

Input impedance

Output impedance

Voltage gain

Differential, Pins 16 and 17

Single ended,Pins 12 and 13

Z

G

580

24

18

W

I,SAW

OSAW

V,SAW

Pins 16, 17 → Pins 12, 13

dB

AGC Unit

Internal voltage for

threshold adjustment

Maximum positive

charge-pump current,

fast mode

Maximum negative

charge-pump current,

fast mode

Maximum positive

charge-pump current,

slow mode

Maximum negative

charge-pump current,

slow mode

High-impedance mode

charge-pump current

Minimum gain-control

voltage

Maximum gain-control

voltage

Without external resistor

Pin 2

= HIGH, V =HIGH,

V

1.94

250

V

TH

V

ICP

200

–300

35

300

–200

55

µA

NWAGC

SLI

pos,fm

P

RF

= –30 dBm, R =12 kW

th

Pin 1

V

= HIGH, V = HIGH,

–250

45

µA

NWAGC

SLI

neg,fm

pos,sm

neg,sm

P

RF

= –25 dBm, R = 12 kW

th

Pin 1

V = HIGH, V = LOW,

NWAGC SLI

P

RF

= –30 dBm, R = 12 kW

th

Pin 1

V

= HIGH, V = LOW,

–55

–50

–45

–35

+50

NWAGC

SLI

P

RF

= –25 dBm, R = 12 kW

th

Pin 1

V

= LOW

ICP

0

nA

V

NWAGC

hi

Pin 1

VAGC

0.5

6.9

min

Pin 1

VAGC

V

max

Control voltage at

NWAGC

Control voltage at

NWAGC

Control voltage at SLI

Band switch

NWAGC = HIGH Pin 14

NWAGC = LOW Pin 14

VNWAGCH

VNWAGCL

3.0

V

1.5

V

SLI = HIGH

SLI = LOW

Pin 3

Pin 15

VSLI

V

H

VSLI

1.5

1.0

3.0

L

Band switch

MXA active

MXB active

MXA,MXB inactive

VBDSW

0

5.0

V

A

VBDSW

4.0

2.0

B

VBDSW

off

1)

Ratio of the output voltage at the primary coil of L4 (Pins 12 and 13) to the input voltage (MXA, MXB).

Measurement corrected by loss of transformer.

Rev. A2, 23-Feb-01

5 (10)

Preliminary Information

U2750B-B

Typical Operation Characteristics

Operating conditions: V = 8.5 V, T

= 27°C, test conditions see figure 7

S

amb

5

–22

–25

–28

–31

f

= 240 MHz

RF

applied to MXA Port

measured at IF Port

0

–5

p

IF

–10

–15

–20

–25

f

RF

= 240 MHz

–34

–37

–40

–40 –37 –34 –31 –28 –25 –22 –19 –16

( dBm )

5

10

15

20

25

30

35

40

14816

p

14818

R

( kW )

RF

th

Figure 5. RF power adjustment by R_th

Figure 3. Overal gain

70

60

50

40

30

20

10

f

= 240 MHz and

= 241 MHz

RF1

RF2

applied to MXA Port

dim3 measured at IF Port

–40 –37 –34 –31 –28 –25 –22 –19 –16

( dBm )

14817

p

RF

Figure 6. Output impedance SAW-filter driver

(Pins 12 and 13 differential)

Figure 4. Third-order 2-tone intermodulation ratio

6 (10)

Rev. A2, 23-Feb-01

Preliminary Information

U2750B-B

Application Circuit (f_IF= 38.912 MHz)

f_IF= 38.912 MHz

L1

V_CC

MXB

100n

100p

100

L3

L2

MXA

100

12p

10n 10n

1n

PLL

LO Port

U2733B, U2753B

SLI

1n

28

27

26

25

24

23

22

21

20

19

18

17

16

15

L1, L2: Toko 617PT–1026

(3T:3Tx2)

L3: Toko 600ENS–9272Y

(6Tx2)

U2750B–B

L4: Toko 600ENS–9273X

(13T:2T)

L5: Air coil enamelled copper wire

(3.5T, d = 3.0 mm)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

NWAGC

V_CC

100p

1n

270

µ

3.3

2.7p 2.2p 2.2p 2.7p

10n 10n

V_AGC

1n

R_th

BDSW

V_Tune

L4

IF Port

12p

4.7k

D1

Cp

L5

22k

Ck

Cp

12487

f

LO

D1

Ck

L5

208...285 MHz

108...285 MHz

BB515

BB619

4.7p

–

22p

100p

3.5T, d = 3.0 mm

4.5T, d = 3.0 mm

Figure 7. Application circuit

Rev. A2, 23-Feb-01

7 (10)

Preliminary Information

U2750B-B

AGC-Voltage Generation Block Circuit

BDSW

MAI

MBI

BUF_IN

AGC_BP

AGC_RECT

1.94V

AGC_TP

SLI

NWAGC

CP

AGC

voltage

Mixer

100

AGC_COMP

AGC_THRESH

CHARGE

PUMP

6.48k

TH

C_AGC

R_th

12488

Figure 8. AGC-voltage generation block circuit

VCO Circuit

V_Bias

V_S

C1VC

B2VC

V_Tune

B1VC

C2VC

12489

Figure 9. VCO circuit

8 (10)

Rev. A2, 23-Feb-01

Preliminary Information

U2750B-B

Package Information

5.7

5.3

Package SSO28

Dimensions in mm

9.10

9.01

4.5

4.3

1.30

0.15

0.05

0.25

0.65

6.6

6.3

8.45

28

15

technical drawings

according to DIN

specifications

13018

1

14

Rev. A2, 23-Feb-01

9 (10)

Preliminary Information

U2750B-B

Ozone Depleting Substances Policy Statement

It is the policy of Atmel Germany GmbH to

1. Meet all present and future national and international statutory requirements.

2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems

with respect to their impact on the health and safety of our employees and the public, as well as their impact on

the environment.

It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as

ozone depleting substances (ODSs).

The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid

their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these

substances.

Atmel Germany GmbH has been able to use its policy of continuous improvements to eliminate the use of ODSs listed

in the following documents.

1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively

2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental

Protection Agency (EPA) in the USA

3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively.

Atmel Germany GmbH can certify that our semiconductors are not manufactured with ozone depleting substances

and do not contain such substances.

We reserve the right to make changes to improve technical design and may do so without further notice.

Parameters can vary in different applications. All operating parameters must be validated for each customer

application by the customer. Should the buyer use Atmel Wireless & Microcontrollers products for any unintended

or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers against all claims,

costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death

associated with such unintended or unauthorized use.

Data sheets can also be retrieved from the Internet:

http://www.atmel–wm.com

Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany

Telephone: 49 (0)7131 67 2594, Fax number: 49 (0)7131 67 2423

10 (10)

Rev. A2, 23-Feb-01

Preliminary Information


型号：	U2750B-BFS
厂家：	ATMEL
描述：	Audio Tuner, 2-Band, PDSO28, SSO-28 放大器射频光电二极管商用集成电路
文件：	总10页 (文件大小：130K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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