s 26 hampshire drive / hudson, nh 03051 / tel: 603-883-2900 / fax: 603-882-8987 / noisesales@micronetics.com www.micronetics.com SMDM-70-TTL d ithering m odules s pecifications analog signal path: pass band frequency: 60-80 mhz insertion loss: 1.0db max impedance: 50 ohm vswr: 1.4:1 max lo rejection: 55db min @ f>450mhz noise output: frequency: 200 khz - 2.0 mhz noise flatness: 2 db p-p max noise power: -40 dbm min , -34 dbm max low pass noise rejection: -150 dbm/hz @ 5.0 mhz -total noise rejection @ f>15 mhz general specs: operating temp: -40 to +85 degc storage temp: -55 to +100 degc supply: 15v + 0.5v @ 75 ma max control logic ttl: logic 1: noise on (internal pull up) 2.8 - 5.5 v logic 0: noise off 0 - 0.75 v how to order: SMDM-70-TTL dithering module, suface mount SMDM-70-TTL-eval coaxial connectorizd, populated evaluation board SMDM-70-TTL o utput c haracteristics micronetics? dithering module is designed as an easy way to eliminate spurs caused by quantization errors in high speed a/d converters. this module feature a patent pending technology to efficiently combine low pass filtered noise with the analog signal, resulting in low signal insertion loss and low power consumption. the module is designed for 70 mhz analog signals (other frequencies upon request) and eliminates the need to design special circuitry for the noise biasing, amplification and filtering as well as combin- ing the signal to the out of band noise. d escription the dithering module is a two port device with an analog signal input and a signal + noise output. the complete noise generating circuitry is contained within this module. the dithering module is specified by two paths, one being the analog signal path and the other being the noise output of the combined signal + noise path. the module also features built in lo rejec- tion filtering. c ommon n oise c onversions ? n = n o + 10*log (bw) ? n o = 20*log ( v rms /hz) ? n = 20*log (v rms ) - 10*log (r) + 30 db where: bw = bandwidth in hertz r = impedance in ohms n = power in dbm n o = power spectral density in dbm/hz
insertion loss lo rejection noise spectrum micronetics / 26 hampshire drive / hudson, nh 03051 / tel: 603-883-2900 / fax: 603-882-8987 / noisesales@micronetics.com / www. micronetics.com
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